Please share your memories of a remarkable scientist, teacher, and friend. 

Posted by Andrea Sant on November 1, 2020
A group of families on Edgemoor Rd raised our kids together with the Knills. We are the only family left on the street. And he was the best among us. Every time I pass their house, I think of what an amazing dad Dave was and how supportive he was to his kids, laughing with them and supporting their hopes and dreams. 

I feel a tremendous sense of loss that that Ari and Josh don’t have him beside them as young adults, but I imagine them remembering things he had shared with them when they were younger and hope that they feel him with them now. 

So many miss Dave in their lives.
Posted by Kathy Nordeen on October 6, 2020
Thinking of Dave and his family on this anniversary of his death. The present tumultuous time we live in makes his absence feel even more acute. It’s uplifting to just remember his compassion, laughter, interest in hearing different viewpoints, and the clarity of his thinking. We need more humans like Dave.
Posted by Greg DeAngelis on October 6, 2020
On this anniversary of Dave's death, I just want to offer a remembrance of Dave to his family and friends. I hope that all of his family members are doing well. Best wishes to all of you. We still miss Dave greatly.
Posted by Kathy Nordeen on November 1, 2018
Thinking of the whole family on this day, missing Dave and feeling lucky to have known him. Ernie and I will raise a glass of beer tonight in honor of all the memories.
Posted by Michael Shadlen on October 6, 2018
It's the kindness that I'm missing most today. That coupled with Dave's no BS engagement with ideas, while never losing contact with the communal aspect of the endeavor (to understand). He shared wisdom mixed with modesty, respect for idea and for the Other. We could use a little more of this in science and society right now.
Posted by Anne Snyder on April 10, 2018
I had to do some research for work and came across an article featuring Dr. Knill. As when I first heard the news, I felt such a pang. I was working as an undergrad student in the Center for Visual Science when Dr. Knill was first interviewed. I remember sitting in on his demo lecture, and then leaving to go tell everyone, "hire this guy!!!" He was at once brilliant and kind, and I think we will all keep on missing him...
Posted by Laurel Issen on November 1, 2017
Happy birthday Dave, you should have been 57 today, with several more years of training another generation of scientists. I feel honored to have learned so much from you, from implementing a Bayesian ideal observer, to avoiding the temptation to chase after flashy experiments and instead focusing on insight and consistency. That's something I still carry with me in my work outside of academia - focus on the projects that are interesting regardless of how they turn out, because they solve the next problem that needs to be solved.

Deb, Ari, and Josh, I think of you often. It's so cruel that Dave was taken from you so early. He always spoke of you with such joy and pride, and I hope you always carry that with you.
Posted by Chris Sims on October 6, 2017
Thinking about Dave after his passing used to be very painful for me, it wasn't a pleasant emotion or experience at all. I just realized today is the anniversary, and find that now while there’s still sadness, it's not exactly a negative experience. I still have thoughts like, “Dave would really appreciate this problem”, and I can think about my time working with him with fondness rather than having my memories corrupted by the pain of his passing. I’m grateful to have all those positive memories lasting beyond the grief.
Posted by Kathy Nordeen on October 6, 2017
I still think of Dave often, and know now, more than ever, how lucky I was to have known him. We need more souls like his walking this earth. His sincerity, compassion, and thoughtful analysis of complex situations was a rare gift. After 3 years, the void left by his passing is still felt deeply.
Posted by Greg DeAngelis on October 6, 2017
Happy Birthday, Dave, we miss you! Like a lot of Dave's colleagues, I'm sure, I often think about him. Dave's wisdom, cool demeanor and sense of humor sure would have been a blessing to all of us during the past year.
Posted by Michael Shadlen on November 1, 2016
I think of Dave often. He comes to mind when I try to be a better person in small and big ways. He showed by example that a razor sharp mind can sculpt and carve without cutting and hurting.
Posted by Oh-Sang Kwon on October 31, 2016
I am missing you, Dave. Happy birthday!
Posted by Oh-Sang Kwon on November 1, 2015
Happy Birthday, Dave!
Posted by Duje Tadin on October 6, 2015
Today’s anniversary is one reminder, among so many reminders of Dave, of our great loss. To Dave, we think of you so often and continue feel the pain of your absence. To Deb and all of Dave’s family, wishing you continued strength, comfort, and happy memories of Dave—as wonderful a person as I’ve ever known.
Posted by Greg DeAngelis on October 6, 2015
Hard to believe it has been a year now. We miss you, Dave. My best wishes to you family and friends on this difficult anniversary.
Posted by Simon Grant on August 27, 2015
I am a neuroscientist working in London UK. I met David only once and, briefly, at Intentional meeting at which he was an invited speaker and had just given an excellent talk. But we had the opportunity to chat informally about our shared interests, from which it was clear that he had all the attributes that others who knew him well have emphasized. He was a giant in the field whose contributions will endure. My condolences to his family.
Posted by Paul van den Broek on June 11, 2015
I am so very sorry to hear about Dave's passing away.and my feelings go to Debbie, the kids, and the other family members. I was a beginning faculty member at Minnesota when Dave joined as a postdoc. The memories tumble over each other: academic and political discussions, skiing on the North shore together, his (failed) attempt to teach me how to properly shoot a basketball, and working with Herb Pick on the cognitive science conference and book. His astuteness, his honesty, and his ability to become excited by just about any challenge to our understanding and behavior became engraved in my memories. His contributions to academia as well as to making this world a kinder place cannot be erased
Posted by Stéphane Rainville on March 4, 2015
I'm terribly saddened to hear about Dave's tragic passing. I got a chance to interact with Dave while I was post-docing at CVS in Rochester between 2000-2002. I can't separate the talented scientist from the great humanist, as he was eager to teach his profound understanding of applied mathematics not only selflessly but also in a way that took active interest in the success of his pupil and the advancement of science in general. A shy demeanour, a welcoming smile, a knowing look, and a genuine humility and kindness all understated the force of his intellect. I will truly miss him.
Posted by Pascal Mamassian on January 1, 2015
Most of us know David Knill for his pioneering work on Bayesian modeling of visual perception. David was unique in being able to combine carefully crafted psychophysical experiments and serious mathematical modeling.

Regretfully, only a few of us have been lucky to interact with Dave. I will remember his generosity in spending time with us in Dan Kersten’s lab, his unpresuming thirst to get to the bottom of a problem, and of course his contagious laughter.
Posted by Bosco Tjan on December 24, 2014
Dave was a postdoc at the University of Minnesota with Dan when I was a graduate student with Gordon and Dan. His office was always in some state of disorganization (but not messy). His thought process was nothing but. Talking to Dave always brought clarity: what were the variables, what to optimize, how to test this? Then there was his characteristic laughter. Just last VSS we were chatting about how we never managed to collaborate on any project.

I received the sad news through a text message when I was at an NIH study section. One of Dave's proposals was discussed at the same study section a year or two ago when I started serving on that panel. I remembered the discussion. The shocking news put everything in perspective. I miss Dave as a colleague and friend!
Posted by Joseph Atkins on December 22, 2014
Dave Knill was as much a part of my graduate experience at UR as my adviser, Robbie Jacobs. No one could have asked for or gotten better guidance through the dissertation process than they provided. What I remember most and best about Dave was his ability to look at a newly published article and after just a few minutes of going back and forth between tables, results, and findings say if it was an example of quality research and if so what it added to our current knowledge. And I quote him often for having said, "we're never going to understand the brain in our lifetimes, but we can hope to narrow that standard deviation of our error". Dave will be missed, but will continue to inspire those who knew him.
Posted by Ladan Shams on December 21, 2014
What a shock, and what a loss to our community! David was a pleasure to interact with; he was full of insight and knowledge, and at the same time extremely modest and generous. His work was solid, elegant, rigorous, and creative. His contributions will be long-lasting and he will be missed as a wonderful peer...
Posted by Amulya Bondada on December 12, 2014
Dave was my adviser at UofR. I also had the good luck of working with an amazing scientist like him on a research paper.
He cared about his students' future. I will never forget the many times that he went out of the way to help me both inside and outside the classroom. Dave played a major role in my undergrad and made my college life a great learning experience. As a mentor, he was always so impossibly patient and calm with me whether it came to teaching, advising or consoling. He always stood by me and gave his support unconditionally. His intelligent foresight and logical manner of thinking was not restricted to cognitive science research but extended to advising on real life situations.
Dave, your kindness will never be forgotten. I miss you and will always remember you.
Forever grateful, Amulya
Posted by Bonnie Kyle-Mistichelli on December 8, 2014
David was one of THE BEST friends I had in our final year at UVA. I was hit hard when I read my UVA Alum magazine class notes last night. Oh, how I wish I stayed in touch. (Note to self and all, treasure your friends - and let them know! - now! )
Memorable forever: one late night we "borrowed" some really old wheelchairs (probably left out for trash) from the hospital. well, we rolled around and quoted the poems we knew - our favorites - and 2 were E.A.Poe. God bless the Knill family, David's wonderfulness will shine on, and we are all blessed by his life.
Posted by David Williams on November 23, 2014
I had the honor and the pleasure of working very closely with Dave since we first began to recruit him from Penn to Rochester until his tragic death last month. Very soon after his arrival in Rochester, I asked him to serve as Associate Director of the Center for Visual Science, which I direct, and he graciously agreed. Since then, hardly any significant decisions were made in CVS without consultation first with Dave. I am so very grateful for the wisdom he brought to each of these decisions. What was so special about Dave was his ability to dissect an issue down to its essence, targeting the relevant aspects and casting aside the irrelevant. Dave was remarkably fair and generous, and his recommendations were impeccably devoid of even a hint of self-interest. Always frank and direct, he confronted the difficult questions head on. He also cared very deeply about his students and their careers. It was Dave, after all, who launched a course to teach them how to write grants, an absolutely critical skill for a successful scientist, especially these days, and one that generally falls outside the usual graduate school curriculum. 
Dave was also a very close personal friend. He and I talked a lot over the years about raising families and adventures we might organize that would create ever stronger bonds within them. Scuba diving was one of these, and I was thrilled that Dave had encouraged his family to learn to dive, as I had sometime earlier with my family.  My son Kris and I managed to dive with Dave only once, and never with our entire respective families. That single dive was an unforgettable experience, a story best told over a beer. I will always deeply regret that we did not find the time for more adventures of this kind together. Dave was so warm, so smart, so thoughtful, and so full of life, it remains difficult to comprehend that he is no longer with us. I will miss him on so many levels, always.
Posted by Greg DeAngelis on November 1, 2014
Happy 54th Birthday, Dave. We miss you.
Posted by Gordon Legge on October 29, 2014
When Dave joined us at Minnesota as a postdoc, he brought us energy, brilliant insights, and wonderful collegiality. I remember him coming to my office to talk soon after his arrival, and flattering me with his interest in my work. Our conversation turned to geodesics, entropy, ideal observers and other interesting stuff. Talking to Dave was always a joy. Dave has been a superb contributor to vision science and a superb friend to all of us who had the privilege to know him. We will miss him deeply!
Posted by dennis levi on October 26, 2014
Dave was a very creative scientist, a wonderful collaborator and a great friend. He will be sorely missed.
Posted by Eileen Kowler on October 19, 2014
I last talked to David at VSS, in front of his poster (with Oh-Sang Kwon and Duje Tadin), and as I remember it Dave was taking his turn, giving the co-authors a break. We had a wonderful discussion of the work (on judgments of position and motion). David was so enthusiastic and animated about the project and the future directions. My heart goes out to his family and friends.
Posted by Adam Bosen on October 16, 2014
Dave was an invaluable voice on my thesis committee, and despite the short time I knew him the lessons I learned from him will stay with me for the rest of my life. It has been truly amazing to hear the stories of those whose lives he has touched, both at the funeral and on this page, and understand the vast impact he has had on countless lives.

One of my favorite memories I have of Dave was very early in grad school, when I stopped him after class to show him a figure that demonstrated a correlation I had found in my data. I was super excited to have found something I thought was worth talking about, and just expected him to take a few minutes to say that my finding looks good. Instead, after I explained what I was showing and how I got to it, he gently told me it was the wrong way to interpret my results. However, I was feeling a bit precious about the figure (I mean, I had found an Interesting Result!) and wasn't willing to let go of it. He picked up on my reservations, so his response was to ball up the figure and throw it into the wastebasket across the room.

What happened next was amazing. Rather than assert his authority and let me figure out for myself where I went wrong, he engaged me in a conversation about how I got to the result now residing in the wastebasket. I explained from the start what I was attempting to do, and he guided the conversation until we together found the point where I'd made my mistake. From there, he patiently laid out the relevant theory and made sure I was getting it, never getting too ahead or impatient with the rate I was absorbing the information. By the end of the conversation he had clearly laid out the right way to get to the goal I was pursuing and made sure I understood how to go about it. In total, he spent about an hour and a half on a conversation he wasn't planning on, but never made any indication that I was inconveniencing him or that he didn't have the time. All he cared about was helping me learn.

I've thought about that meeting a lot since then, and the lessons wrapped up in it. The first was a fundamental shift in the way I viewed my work. Research isn't about a blind scramble to find patterns, but rather an organized attempt to understand the how and why underneath what we observe. Despite being one of the fathers of applying Bayesian Inference to perception, he was always very clear in his belief that it was only a tool to help us understand the brain, and was not one to get carried away with putting theories ahead of reality. He was equally comfortable talking about theory and experimentation, which gave him deep insight into the meaning of both. The second thing I learned was from the way he treated me throughout the conversation. It could have been a defeat, and yet he turned it into progress. In that moment and in several conversations since he has demonstrated that keeping the well-being of others as a top priority is not incompatible with being a top tier scientist. It was amazing to hear the scope of his sincere caring for everyone he met, and encouraging to know that there is opportunity for a family man to pursue an academic career.

Dave will forever be a role model to me. Moving forward, I am going to do my best to use his lessons to walk a path similar to his, both professionally and personally. I believe the best way to honor him is to remember how he lived, and use the memory of his care for others as a template for how we should live.
Posted by Jenny Read on October 16, 2014
I did not know David personally, but I greatly admired him as a scientist. His book "Perception as Bayesian Inference", co-authored with Whitman Richards, is both profound and beautifully written. It made a great impression on me as a new scientist just moving into vision from physics; in fact two of my very first vision papers are basically an "homage" to David's book. I was appalled to hear of his tragically early death. This is a great loss to science even if our loss is insignificant compared to the blow suffered by his family.
Posted by Wei Ji Ma on October 13, 2014
While any premature death confronts the left-behind with the maddening frailty of life, my first response to the news of Dave’s passing was to shout why, of all people, he had to be the outlier. Dave was one the most wonderful people I have known. He was my advisor on a side project I did as a postdoc at the University of Rochester in 2007-8, on causal inference when combining peripheral visual information with memory for reaching movements. Dave generously made his time, insights, and lab resources available to this theoretical neuroscientist who wanted to get trained as a psychophysicist. In our discussions, he was always two steps ahead, but also always made sure I caught up. Dave was the kindest, gentlest mentor one could ever wish for, and had the extraordinary ability to take the pressure off of doing research. Research is stressful for many reasons, but it really helps if your advisor is not judgmental, makes you feel like an equal collaborator rather than like a minion, and prefers solid work that stands the test of time over fancy but fragile publications. Dave also had immense patience with struggling students, and treated students and postdocs with the same level of respect and engagement as professors.

After I had started a faculty job in Houston and could not finish my project, Dave was very understanding in spite of all the time he had invested in it. We kept in touch since. I found myself following Dave’s lead in many aspects of my academic life: exploiting the power of psychophysics for comparing process models of brain function, not shying away from the effort needed to “clean up” existing literature, and attempting to improve education (Dave once taught a statistics class for psychology majors entirely from Bayesian principles…). Dave was my favorite workshop invitee (on high-level vision in 2010, and on visual working memory in 2012), and my favorite suggested reviewer because of his breadth of knowledge and his fairness.

In scientific conversations, Dave’s comments were typically unassuming and unintrusive, but crystal-clear and the most valuable of all. He grasped new ideas very quickly. Back in Rochester for a talk in 2011, I told him about a new data set that we had collected, and with a single question (did you try an ISI of zero?), he revealed its flaws. During my talk, he correctly guessed the details of the categorization task we had used, because he had used a similar task 16 years earlier; amazingly, there was no trace of annoyance at my ignorance.

Unlike many scientists, Dave cared about the real world. Over dinner during the working memory workshop in Portland in 2012, we got to talk about the real-world applicability of our type of research, and Dave argued that a model-based understanding of working memory might lead to better diagnostic tests of concussion/traumatic brain injury. It was not only clear that he had far more than superficial knowledge of the practical need for such improved diagnosis in competitive sports (much more than say the average NIH grant applicant has about the disease they claim their research will help cure), but also that he cared deeply about the athletes’ fates.

I spoke with Dave most recently at the Vision Sciences Society meeting in May 2014, where he spontaneously sat down for an hour with my student Edgar Walker and me to give feedback on the talk on the aperture problem that Edgar was going to give the next day. He had no stake in the project at all.

One more memory I have of Dave is not science-related. One day when I was sitting on the sidelines in the U of R gym waiting for a badminton court to open up, I happened to see Dave play basketball with his sons on the neighboring, otherwise empty court. It was a beautiful image of family bonds.

Dave, I will miss you a lot.
Posted by Amanda Yung on October 12, 2014
It was great working for Dave in his lab as a programmer for the past four years. He was supportive in my work when I hit roadblocks, and he could easily explain complex concepts in such a natural way when he scribbled diagrams or equations on the whiteboard. After hours of programming in a freezing air-conditioned room, it was reassuring to step out to the lab conference room and see Dave there, always with a 7-Eleven Big Gulp or Coke can nearby, to happily answer yet another one of my questions. And he'd sometimes take me by surprise as well with an out-of-the-blue email of thanks for getting something done, even though it was just an everyday part of my job.

Dave also taught me the importance of work-life balance, which initially clashed with my workaholic tendencies. On my first day at work, not even an hour into my first project, he came by to tell me to take it easy and spend time settling into the department and Rochester; having a life outside of work was just as important. He also worried for me when I started my masters program part-time with an ambitious courseload and wanted to check that I still had time for myself even after work hours and class hours. Not to mention, it was always easy to strike up a conversation with him about non-work related topics, even during work meetings.

Although I only knew Dave mainly within the confines of Meliora Hall, I could tell he followed his own advice, from the many times he'd be out spending time with his family, or instances like the department canoe trip where he'd eagerly play ultimate frisbee alongside undergrad and grad students. (One time, he had forgotten his frisbee and drove half an hour just to get it and come back.) Dave had an infectious joy of life that I'll sorely miss, but I hope I and others who knew him can keep that life-loving spirit going strong.
Posted by Kathy Nordeen on October 12, 2014
Thoughtful, smart, other-centric, sincere – these are the words that come to mind when I think of Dave. Although we didn’t have any research collaborations, I worked with Dave on many committees and we had numerous conversations about education, politics, family, and travel. One characteristic that stands out is that Dave was an exceptional listener. No matter what priors he might have on a topic, he would really hear and evaluate different points of view and was comfortable expressing a change of position if new information was persuasive. Outside of meetings, our conversations often turned towards family (our kids are about 10 years older than Ari and Josh): there was never any doubt that this was where Dave’s heart was anchored. During those years of angst that most of us travel, when kids resent much of what their parents do and parents are wrestling with whether they should do more or less to keep their kids safe, Dave particularly enjoyed hearing about some of the crazy experiences we encountered and how we and our kids coped with those events. When I asked just a few weeks ago how Josh and Ari were doing, the emotion that came over Dave was especially heartwarming. The light in his eyes and smile that came over his face left no doubt that his sons had grown into young adults that earned his utmost pride and respect. Given the person Dave was, I know that he set a high bar for his kids, and I’m confident that Dave’s essence will live on through them. I’ll miss sharing time with Dave; I feel lucky to have known him.
Posted by Frank Garcea on October 11, 2014
Dave was a professor of mine in the brain & cognitive sciences department. He was such a kind man. I'll never forget the many interactions we had in class and out of class; we would often chat about visual processing, FC Barcelona/soccer, and a myriad of other things. He was a brilliant man, and simply put, a nice, compassionate person. Dave's passing is so sad, but he will be remembered as an amazing person who touched the lives of so many people around him.
Posted by Vikranth Bejjanki on October 11, 2014
Dave was a wonderful teacher, collaborator and friend to me, both when I was a graduate student at the University of Rochester, and in the years since. While he wasn’t my primary advisor, I was fortunate to work closely with him for a number of years. He was always generous with his time, advice, knowledge and encouragement, and so much of my training and interests can be traced directly back to him. More than anything else, he inspired me to be a better teacher, a better scientist and a better mentor and his example will continue to guide me in the years to come.

Dave had an incredible passion for discovery - he insisted that the point of research wasn’t just to publish papers, it was to learn something new. He would get so excited about every new idea that we would discuss, and he would be impatient to find out what the next analysis might show. He also brought a love of rigor to his science, “good enough” wasn’t ever good enough for him - he wanted to run one more experiment, one more analysis and one more test to really make sure that we understood the underlying process. Dave was also a wonderful example of how one might balance work and fun. While he derived great joy from research, he truly enjoyed so many more things - his family, running, skiing, scuba diving, Belgian beer, New Orleans, and the list goes on. 

I will miss Dave very much. I will miss his steadfast encouragement, wise counsel and his impeccable moral compass. I will miss being able to get his advice on whatever project I am working on, I will miss writing papers with him and most of all, I will miss talking to him.
Posted by David Brainard on October 11, 2014
I didn't know Dave super-well, but we work on similar questions and I always looked forward to chatting with him at conferences, when he visited Penn, or when I visited Rochester. He was deep in his thinking and generous with his insights, and his ideas were helpful to me in my own research. He developed a beautiful demonstration that illustrates how perceived 3D shape can interact with perceived surface lightness, and I often take advantage of this when I teach. I will miss him.
Posted by Santiago Alonso-Diaz on October 11, 2014
I meet Dave as a professor and director of the graduate program. He was a wonderful person. I will always remember a meeting with him. I was struggling with a research paper so I asked him for a meeting because of his expertise. The day of the meeting I mixed the hours and ended up arriving late and he was not in his office. To my surprise, even though it was my mistake, I received an email from him to reschedule. The meeting ended up being an incredible intelectual interaction, one that will leave a lasting impression on me. He is a great loss and my warm considerations to the family and friends.
Posted by Bill Geisler on October 10, 2014
I am greatly saddened to loose Dave as a friend and colleague. He was a major contributor to experiment and theory in vision science. I am grateful not only for is contributions to the field, but for the specific feedback he provided to me about my own efforts. Dave was easy and fun to talk to about all topics. It was just a six weeks ago or so that we had a couple of long discussions about science and other things. He seemed as strong and healthy as ever, with that usual gleam in his eye. I will miss him.
Posted by Sarah Creel on October 10, 2014
Whenever I think of my graduate years at Rochester BCS, Dave is one of the people who particularly stands out. He was that combination of brilliance, humility, and kindness that makes for the best scientists and the best mentors. My heartfelt condolences to Dave's family and Rochester colleagues.
Posted by Ruben Coen-Cagli on October 10, 2014
I have met Dave very briefly, few hours only. Yet, he made a fantastic impression on me and I feel so saddened at his passing. Just one short scientific conversation with him was enough to generate several ideas for exciting new experiments, and his genuine enthusiasm for science was absolutely contagious. That spark in his eyes, only very few have it.

We talked briefly about basketball, another passion we shared, and I can't forget his smile when he told me about 'the lunch-bunch' games. I wish we could have played one or two.

My deepest condolences to Dave's family, and to his many friends and colleagues.
Posted by Suliann Ben Hamed on October 10, 2014
I spent two years at the University of Rochester as a post-doc at the Brain and Cognitive Sciences department. I have a vivid memory of the contributions of David Knill to the weekly seminars, with sharp deep incisive questions, bringing us all at the closest of the scientifique question, but always offered with the utmost humility and genuine enthousiasme. This memory of him is and will continue to be inspiring.
Posted by Bradford Mahon on October 10, 2014
Dave's passion for the projects and ideas that he was excited about was inspiring. He would become so animated and joyful when talking about something important. It made me want to be a part of whatever he was talking about. I will miss that.
Posted by Ernie Nordeen on October 10, 2014
Dave was a great colleague and a just a really good guy. His life was balanced, and it was clear how much he valued his family. Working with him was a pleasure. He listened, was completely unselfish, and was extremely insightful in a gentle, cooperative way. I will miss him in the department and I will always regret having not spent enough time with him as a friend.
Posted by Alex Fine on October 10, 2014
I knew Dave when I was a grad student in BCS. I attended his seminars and TA-ed for him for a semester. What stuck with me most about Dave was his completely uncanny ability to explain tough concepts with clarity, precision, and profoundly earnest excitement and curiosity. He was equally in his element explaining the t-distribution to undergrads, sparse coding to grad students, and catching fly-balls (using basic principles of depth and motion perception, of course) to his son's baseball team. He simply had a gift and a passion for teaching.

As much as that, though, I'll remember the warm, casual, but stimulating chats I had with Dave over the years about running, riding bikes, dogs, music, being from the south, having a beard, and a hundred other things. I know I'm only one of hundreds of students and colleagues whose days were made a little easier and a little brighter by Dave.
Posted by Ben Backus on October 9, 2014
When I start a project or write a paper, I ask myself--literally--what Dave will think of it. I've done this for many years. I know I'm not alone in doing this. We will keep doing this of course, and it's one of the ways Dave will live on. I will dearly miss his friendship too.
Posted by Celeste Kidd on October 9, 2014
Dave was a mentor to me as a graduate student, and I TA'ed statistics for him for two years. He was an incredibly dedicated and talented educator, and embued all of his students with his own zeal for scientific skepticism in a way that inspired me to want to do the same. Dave was also a mentor to me as a senior faculty member in Brain and Cognitive Sciences, and, in both roles, offered me incredibly thoughtful tips and advice in moments where he observed that I could use them. Midway through my grad school career, during a meeting in which I dropped my pen and cellphone repeatedly due to sleep deprivation, he casually mentioned a cool paper he'd read on the long-term consequences of sleep deprivation on cognitive function and memory, and offered to print me a copy if I wanted (which I did). It was really considerate and kind, which is how he was always. Dave was also the only other person in my department who was from New Orleans, and who reliably wished me Happy Mardi Gras each year. He made the department feel like a home for me, and for that, I will always be greatful. He will be fondly remembered and deeply missed.
Posted by Michael Shadlen on October 9, 2014
I knew Dave from Brown days back in the late 1980s and we have kept in touch through meetings and shared interests ever since. Our conversations ranged from soccer to science to family, politics, recovery from various aches and pains. Besides his brilliance, I knew Dave as a sweet, kind, authentic person. His brilliance, creativity and integrity shone through, although he appeared almost ego-less. In fact the only times I can remember Dave bragging is when discussion turned to soccer. I can't resist one science memory. I credit Dave with the suggestion that the phenomena that fall under the rubric of "change blindness" would be more aptly explained by "change distraction". It's a tiny fragment of the wisdom he uncovered and shared, but it's a memory I cherish. My heartfelt condolences to Dave's family and the large community of scientists and friends that loved this great man.
Posted by Michael Scott on October 9, 2014
For many years Dave has had a secondary appointment in Computer Science. While I didn't have a chance to collaborate with him personally, his presence was a valued addition to the department. My heart goes out to his family and friends, and especially to his wife, Deb, whose amazing work with the Writing Center has done so much to enrich the University.
Posted by Steve Piantadosi on October 9, 2014
Dave was an incredible colleague. My last substantial interaction with him was typified the honesty and clarity he, literally, brought to life. He wanted to talk about an honor court case, discussing the moral and statistical implications of different choices of priors and likelihoods and how a good Bayesian should decide cases of academic cheating. It was a wonderful to see him deploy his technical expertise in a moral domain so close to his heart. I will remember his unflinching precision in reasoning throughout all searches for truth. He leaves a legacy in my mind of dedication to honesty and care in all things.
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Posted by Andrea Sant on November 1, 2020
A group of families on Edgemoor Rd raised our kids together with the Knills. We are the only family left on the street. And he was the best among us. Every time I pass their house, I think of what an amazing dad Dave was and how supportive he was to his kids, laughing with them and supporting their hopes and dreams. 

I feel a tremendous sense of loss that that Ari and Josh don’t have him beside them as young adults, but I imagine them remembering things he had shared with them when they were younger and hope that they feel him with them now. 

So many miss Dave in their lives.
Posted by Kathy Nordeen on October 6, 2020
Thinking of Dave and his family on this anniversary of his death. The present tumultuous time we live in makes his absence feel even more acute. It’s uplifting to just remember his compassion, laughter, interest in hearing different viewpoints, and the clarity of his thinking. We need more humans like Dave.
Posted by Greg DeAngelis on October 6, 2020
On this anniversary of Dave's death, I just want to offer a remembrance of Dave to his family and friends. I hope that all of his family members are doing well. Best wishes to all of you. We still miss Dave greatly.
Recent stories
Shared by Robert KEMP on March 9, 2017

David and I were neighbors and best friends in New Orleans.  This picture was taken in December 1969 I believe at one of my birthday parties.  I'm shocked to have just learned of his passing.  We had some great times when we were kids.

Shared by Robert Kilmer on October 10, 2014

Dave loved the game of soccer!  I had the fortune of capturing this moment of joy between Dave and his son Josh during a fun game a few years ago (2008).

Shared by Anne-Marie Brouwer on October 10, 2014

Over the last few days I have been thinking a lot about the time that I was Dave's post-doc. I changed to a somewhat different research field since then, but I always imagined meeting him again at a conference where we would chat about what we had been doing since. I am very sad that that will not going to happen.

I remember arriving in Rochester for my new job, together with my (since a few weeks) ‘dependent alien’ husband Andries, while our luggage got lost somewhere on the way and being somewhat shocked about the basement where everybody was working without any windows!?! Dave seemed to be happy enough though. Who needs windows when you can talk and think about cue combination and modelling, when you can write, program and simply get to the bottom of anything that needs to be figured out! I was very happy to work with someone that smart, that dedicated to science and so completely uninterested in trivial things like status and citations. He also wanted us students and post-docs to feel at home, and organized Friday afternoon drinks where we discussed religion and politics. For Andries and me, the opportunity to work in Dave’s lab also gave us the interesting experience to live in the US for a while and to explore the beautiful surroundings. I have very fond memories of a weekend in January 2007 when Dave invited CVS at a house somewhere in the snow. I don’t remember exactly where it was, but I do remember Dave’s warm hospitality (we were allowed to smuggle in a friend from the astrophysics department), playing games in the evening, cross-country skiing and trying out snow shoes for the first time in my life. We had a lot of fun, and I am sure Dave too, even though he could not stop himself from spending some time to work during this weekend as well!