He changed the way we measure things.
  • 91 years old
  • Born on July 18, 1926 in Mosul, Iraq.
  • Passed away on August 14, 2017 in Pittsburgh, Pennsylvania, United States.

This memorial website was created in memory of our loved one, Thomas Saaty, 91, born on July 18, 1926 and passed away on August 14, 2017. We will remember him forever.  Please join us for a memorial in the November timeframe to commemorate Tom (more information to come).  We hope that you will plan on attending ISAHP 2018 in July in Hong Kong www.isahp.org and you can look for all things AHP and ANP at www.creativedecisions.net

Posted by Chris Everett on 6th June 2018
Goodbye Dr. Saaty, though I never knew you at all you leave behind a body of work that has enriched my life, the lives of my colleagues, and the lives of the millions/billions of people who have benefited in unquantifiable ways from the improved decision-making that you made possible.
Posted by Kathy Alstrin on 24th February 2018
Dearest family of Dr. Saaty, My heartfelt grief for the loss of this wonderful man! I was privileged to have taken his last course shortly before his passing. He thought I was goofy for asking him to sign my copy of his books... now I'm so glad I did. What an amazing spirit!
Posted by Leopoldino Vieira on 10th February 2018
I did not personally know Dr. Thomas Saaty, but I knew through his work the Analytical Hierarchical Process - AHP that he shared with me in his writings, as well as the Analytical Network Process (ANP). Works that help me and also the decision makers to find a solution that best suits their goals as well as understanding the problem. Relying on mathematical models and psychology (The Psychology of Fonts) he formatted a combination of data judgments, mainly used to analyze complex decisions. Prof. Dr. Leopoldino Vieira http://www.leovine.com.br
Posted by Harwinder Singh on 8th January 2018
Professor Tom Saaty a great personality. I met him during ISAHP 2014. No words to express....A real GEM.
Posted by Sam Sharp on 29th December 2017
My first introduction to the name Saaty was through his book 'Non-linear Mathematics' which I studied in the seventies. I next encountered it when I became interested in the AHP and attended the 2009 ISAHP in Pittsburgh, principally to meet him. During my first conversation with him I mentioned that my AHP students tended to guess the priorities at the lowest levels of the hierarchy. His response was to punch me in the stomach and say "That is not AHP!" Another lasting memory relates to the last day of the symposium when he invited me to sit alongside him during a discussion session. This was apparently a reward for making a speech on behalf of all the overseas participants the previous evening on the river cruise, thanking him, Rozann and the organisers for their hospitality. During the discussion I ventured an opinion on something. He apparently approved because he leaned over toward me and whispered. "I could kiss you but I don't want to embarrass you.' The four days in Pittsburgh were amongst the most memorable of my entire career. With his wisdom, humour and intellect Professor Saaty cast a spell over the entire decision-making community from which we will all continue to benefit.
Posted by Michael Promentilla on 6th December 2017
Dear Prof. Saaty, You are such an inspiration to me..a great mentor and a creative scientist. Although I have not met you personally, it is indeed my privilege to have known you more than a decade through your books and papers on AHP and ANP while I was doing my postgraduate studies in Japan. The theory and tools you have developed played a significant role in my scientific and academic career, and I will always remember and honor you everytime I teach and use AHP/ANP in my class here in the Philippines. Thank you for your "beautiful mind" and I will always be grateful for your legacy, and I wish in another time, or perhaps in another parallel world, I would have the opportunity to converse with you in person and learn more about life and decision theory in particular. Yours truly, Michael Angelo B. Promentilla Professor of Chemical Engineering De La Salle University Manila Philippines
Posted by Angel Coca on 4th December 2017
Operations Research is Math and Professor Saaty used mathematics to create AHP an useful method in decision theory.
Posted by Daniel Aviles on 29th November 2017
" Knowing more does not guarantee that we understand better..." - Thomas L. Saaty, "Decision making with the analytic hierarchy process", Int. J. Services Sciences, Vol. 1, No. 1, 2008. Genius! I never met you but your work was (and still is) an inspiration for my development as a researcher. Peace to the family and a sincere condolence.
Posted by Nzinga René on 21st November 2017
I never met Prof. Thomas Saaty in person. I remember some years ago I was trying to apply Mathematics to real-world problems and I had this awesome privilege to receive some materials related to AHP/ANP from my supervisor who also suggested me to write to Prof. Saaty for a particular problem I had with the theory. To my surprise, despite my poor English, he and Mrs. Saaty replied my email so fast, answering my question and even sent some other materials. I was astonished for being the very first email I received from a scientist. I am thankful for his support and effort for providing an efficient scientific theory which helped me to use numbers for consistent decisions. My deepest condolences to the family and friends. My the peace of the Lord Jesus be with you all.
Posted by Mohamed Shalaby on 12th November 2017
Long time ago, in Summer 1972, this man introduced me to Operations Research at Cairo University. I listend as a newly graduate IE to him in Queueing theory, to Dantzig in LP, to Elmaghraby in networks, to Mangazarian in NLP, to Taha in IP, to Kamal el-Din in simulation, who were supporting our new MSc program voulantarily. He was among our distinguished grand dadies who made us love what decision making is and make it our career. His book, Queueing theory, was "The reference" for my generation in stochastic processess 45 years ago. I enjoyed the character, the drive, the motives, and the scientist. I, at 71 years old, realize through his rich trip what giving is. May Allah bless his soul.
Posted by David Taylor on 11th November 2017
A truly great man amongst men. The one person, more than any other, who encouraged me to take and pass my PhD. Sitting in his house discussing things intangible over lunch, remains one of my fondest and uplifting memories. So sorry to hear of Tom's passing. My thoughts are with the family. Rest In Peace, a real genius, Professor Thomas Saaty.
Posted by Theo Dijkstra on 1st November 2017
Professor Saaty was one of those truly great scientists who used their outstanding gifts and talents for the service of mankind. I respect him deeply. I fondly remember his very kind and helpful response to a query of mine, three decades ago, a query of a young person he had never met. My sincere condolences to Professor Saaty's family and friends. He will remain an inspiration to us all.
Posted by Angel Zang on 30th October 2017
Please accept my heartfelt condolences. I took Dr. Saaty's class over 10 years ago and was thoroughly amazed; it changed the way everyone thought about making decisions. I was impressed by him and appreciated his generosity in sharing his work and his family-Rozann and John have helped me with projects over the years, too. I have hoped many times that the people making the most difficult decisions know about his work and use it, too. I check out John's clients and the conference info sometimes, just to see what the world's best and brightest are doing with it.
Posted by Miroslaw Dytczak on 22nd October 2017
I would like to expres my deepest condolences to the family. Great teacher, great scientist, great men forever.
Posted by Konstantinos Kirytopoulos on 19th October 2017
A farewell to one of the most important contributors of the MCDA family. You will be sorely missed.
Posted by José Manuel Magallanes on 12th October 2017
Profesor Saaty será por siempre una gran figura en el mundo de la ciencia; y siempre permanecerá fijo en los recuerdos de aquellos que tuvimos la suerte de conocerlo y estrechar su mano. Lo extrañaré mucho, será muy raro llegar a Pittsburgh y darme cuenta que no podré pasar a visitarlo ni a disfrutar de su hospitalidad. Professor Saaty will a world science figure forever; and he will always stay in the memory of those lucky ones who met him and shook his hand. I will miss him so much... It will be very odd to arrive in Pittsburgh, and realize I will not be able to see him and neither enjoy his hospitality.
Posted by Henry A Donegan on 10th October 2017
Tom was a man of unequaled distinction. I had the honour of meeting him on a number of occasions and on each meeting he contributed to my decision making philosophy. I have to thank him for providing a learning base for countless PhDs. Bless you Tom Saaty.
Posted by András Farkas on 7th October 2017
I would like to express my sincerest condolences to the family on the passing of Professor Saaty. His distinguished academic achievements in maths and decision theory and some personal meetings with him in Pitt have helped me to make a modest contribution to multiple criteria decision making. Let him rest in peace.
Posted by Syafrizal Maludin on 1st October 2017
Thank you for outstanding achievement and contribution to the world of knowledge.
Posted by Thomas Harker on 1st October 2017
Thomas Saaty: my namesake. (Although his first reaction upon hearing this from his daughter Emily in 1986 was, "But I'm not dead yet!"). I'll never be able to fill your shoes, Grandpa, but I see more of you in me as I grow older, and am so blessed. Don't know whether it's genetics or the selective environmental pressures of the Saaty back porch: memorizing Renaissance artists (with quizzes of course), talking at length about God and the universe (I faked my way through most of those conversations, parroting back your big words and ideas until I understood half of them), laughing and always learning. Grandpa, I don't know if this world will ever again have a man of your character, but please continue to bless us with bits and pieces of it both inside ourselves and in the people we meet. I love you.
Posted by Chinh Luu on 14th September 2017
Prof. Thomas L. Saaty was so kind. He replied my emails with helpful comments on AHP model and AHP pairwise comparisons in my research although he did not know me. He is a famous professor and I am a student in a poor country. I am always grateful for his kindness. Rest in peace Professor Thomas Saaty, a great personality.
Posted by Syarif Hidayat on 13th September 2017
I have never personally met Prof Saaty, but I read some of his books and many papers concerning AHP-ANP. When researching for my dissertation I used Fuzzy-AHP method due to the complexity of the problem and data I needed to analyze, as well the many respondents with diverging opinions on the subject matters. Thank you Prof Saaty for developing such a useful method for researchers around the world. As a lecturer I noticed that many of my students go for the same method I used (AHP-ANP) without being instructed. That indicated that the method is so popular and not that hard to understand and use. Dr Syarif Hidayat - lecturer in the Faculty of Science and Technology, University of Al Azhar Indonesia - in Jakarta, Indonesia
Posted by Mark Ridgley on 7th September 2017
I am terribly sorry to hear of Tom's passing. What a loss not only for his close family, and for all of us who knew and loved him, but also for humanity in general. His drive to make the world a better place through the intelligent and humane application of mathematics--and to make math, especially through the AHP, the servant of mankind rather than lord over it, is sorely needed and will be greatly missed. His example and sage advice provided much guidance and mentoring for my own professional development, and I will be forever grateful. His humanity, generosity, and genuine caring touched my life immeasurably. I will miss him dearly and treasure the times we spent together. Sharing belly-aching laughs with him surely ranks near the top of those times. He'll remain one of the bright beacons of my life.
Posted by Nina Szklennik on 3rd September 2017
I was privileged to know him. He taught me so much. A beautiful mind, the best mentor, full of love and inspiration. Thank you for everything that you have done for me, for us, for the world. I miss you. I am so sad.
Posted by Sikuade Jagun on 1st September 2017
Emanation and absorption. Tom Saaty, the Genius, the Master, the Kind.
Posted by John Saaty on 1st September 2017
Tom remembered in the obituaries section of the newsletter of the International Society for Multi Criteria Decision Making (MCDM). Thanks to Luis Vargas for his thoughtful contribution. Dear members of the International Society on MCDM, The new issue of the newsletter is published today. You can find the newsletter on our website. http://www.mcdmsociety.org/newsletters/92017-september-2017.
Posted by Dori Davari on 27th August 2017
I just heard about it... I am so sorry and wish this hadn't happen. All I can say is that Professor Tom Saaty is always alive. I hope good things happen to his family that would help them tolerate this loss.
Posted by Jen Shang on 26th August 2017
Tom was a tremendous person, a great teacher, and one of the most influential researchers in current time. He is a dear friend whose company I truly cherished. Tom will be remembered by all of us as a man of great wisdom, courage and generosity. We love you, Tom! May your eternal soul find rest in perfect peace!
Posted by Glenn Mazur on 25th August 2017
Tom was the only Erdos 2 mathematician I could understand. Tom's classes made sense, even to a fellow like me. Perhaps it was his sense of humor - I still "regularly" read from my collection of his joke books. His work added quantitative rigor to my field of QFD, and AHP/ANP are now cited throughout our new ISO 16355.
Posted by Hameed Nezhad on 24th August 2017
Tom is one of the few people who changed the way I think professionally and personally. I am proud that I had started spreading AHP in China and other parts of the world. He will be remembered around the world for generations. I already miss him!
Posted by Majid Azizi on 24th August 2017
Tom transmitted me a lot of motivation to do my best researches and training. Tom was full of spirit and esprit. I am very sorry missed a good friend forever.
Posted by Kenneth Tombs on 24th August 2017
twenty years, new perspectives mad ideas, respected always beautiful places, sharing knowledge science and family, nothing better
Posted by Nikolai Bobylev on 23rd August 2017
Tom was a remarkable person. A first class scientist of course, and yet very simple, clear, and friendly, that very complex concepts of math and life would come out naturally in a conversation. I started knowing about Prof. Saaty through AHP, later I was given a privileged to meet Tom personally and discover that it is so much more to learn from him than decision analysis. Indeed, during my time in Pittsburgh I've learned about creativity and how to confront problems trying to decipher them and put ideas in order to easily use them further. Now I continue teaching AHP-ANP and its environmental applications at Saint Petersburg State University, and looking forward to a new semester when I can give my students a drop of inspiration from the ocean that Tom provided me with.
Posted by Pierfrancesco De Paola on 22nd August 2017
Thanks for the simplicity of your words, with which you've always responded to me. Thanks for the precious opportunity you gave me and for your teachings.
Posted by Ali Soltani on 22nd August 2017
Thomas was not a hero, he discovered nothing because he was a hero, he did not work hard because he was a hero; he did not suffer quietly because he was a hero; he did not persist stubbornly because he was a hero. heroes do what they do because they are heroes, like being able to quack because you are a duck. Hero-worship denies his achievements, makes him god-oid. Ali Soltani Professor of Urban Planning & Transport Univ. of South Australia
Posted by Robert Cartia on 21st August 2017
Tom impacted my life in a way that no one else has. Tom had a special way of providing feedback that then became a vehicle for the person receiving it to want to make the necessary changes in order to positively impact the world. I will forever be indebted to Tom for providing me feedback that resulted in a few sleepless nights.
Posted by Fabio De Felice on 21st August 2017
There are no words to express my sadness… He will be missed...Tom will always stay in my heart wherever he is!
Posted by John Saaty on 21st August 2017
Pittsburgh Post-Gazette Obituary, Sunday August 20 2017 http://www.post-gazette.com/news/obituaries/2017/08/20/Thomas-L-Saaty-obituary-mathematician-University-of-Pittsburgh-Analytical-Hierarchy-Process/stories/201708200134
Posted by Rustam Ishenaliev on 21st August 2017
Tom has enlightened me with his tremendous work which helped me to succeed professionally. After an email contact when I was deciding on my thesis research, one day I was pleasantly surprised to get his books on AHP/ANP couriered to my doorstep all the way from US to Thailand. So, I was then very sure what my thesis research was going to be! I met Tom and Rosanna nearly 15 years later when I traveled to Pittsburgh and spent a wonderful time with them. Brilliant man, beautiful mind... he will be dearly missed!
Posted by Eric Letsinger on 20th August 2017
Tom Saaty was a pure force of nature. To be with Tom was to to be challenged to learn smarter, to improve, to demand better of ourselves and one another. He was a teacher, a mentor, a rock star father, an inspiration and absolutely hysterical. I am a lucky friend of his son, John. I was fortunate to have enjoyed numerous meals, conversations and gatherings with the Saaty Family. Tom always brought his special blend of candor, humor, curiosity and inquisitiveness to each conversation and interaction. Thank you, Tom, for including me in your incredible life. Than you, Saaty Family, for sharing him with me. Cheers to all of you. Eric
Posted by Asma Bahurmoz on 20th August 2017
On July 15th 2017, I wrote to Tom saying “You are a role model for me and for many generations to come”. I am glad he read it and answered my email. This is typical of Tom since the first day I met him in IFORS 1997 Barcelona, he would respond to every email he received. Tom converted me from being strong believer in mathematical methods seeking exact solutions into ardent believer in AHP/ANP methodology in solving hundreds of real life problems. Tom developed and taught a course on Creativity. To me Tom was The Creativity itself!
Posted by Riri Satria on 20th August 2017
A great man! His legacies, AHP, ANP and others, are enlightenments for rational decision making process, not just techniques, but more than that, they are philosophies. I teach AHP and ANP for my Research Methodology class and supervising master student thesis on these topics at University of Indonesia until now. We miss him a lot. Rest in peace, Professor.
Posted by Nabil Saaty on 20th August 2017
Tom and my father were first cousins, but Tom and I were only seven years apart in age. So, we were not only cousins but also friends who socialized and played tennis on the court of Washington Missionary College, Takoma Park, MD, where I was a student, and where Tom and his very young family lived for many years, starting in the early 195Os. Tom was then a recent Yale-Ph.D. graduate who had only recently started his first employment, so he didn't even own a car. On the other hand, thanks to my dad's generosity, I had a 1938 Pontiac, which Tom borrowed to pick up his new Stromberg-Carlson High Fidelity set from Baltimore. Soon thereafter, my cousin gave me an album of Johann Strauss's The Gypsy Barron, which was my introduction to classical music. I still own and treasure that album...and all the other warm memories of Tom and his extraordinary mind. Tom's life-long achievements literally memorialized the Saaty family name. Thank you, dear cousin. Rest In Peace.
Posted by Mustapha Bello on 19th August 2017
It was my honor to have worked with Tom as his Teaching Assistant and Course Grader. I am saddened to learn of his passing and offer my sincere condolences to Rozann and the family. I however believe this is one of those rare cases where an extraordinary life should be celebrated. Tom lived a long and fruitful life with substantial contributions to Decision Sciences and other realms. His wisdom, ingenuity, hospitality, generosity and sense of humor ensured he made a mark on one’s life for however short or long the period of interaction was. Tom, it was a privilege to have known you. AHP and ANP have since become a part of my system. You will always be remembered and you will always be missed. Thank you, Mustapha A. Bello Ph.D.
Posted by Astrid Oddershede on 19th August 2017
Death is not the end, Tom, has generated a greatest contribution to the world. A wonderful person, full of love and inspiration. We will always remember his generosity, hospitality, creativity and his sense of humor. I thank to have had the honor to meet you and learned lots from you. Tom , you will be present for all time in my spirit . Astrid.
Posted by José María Moreno-Jimé... on 19th August 2017
With our whole gratefulness and affection for allowing us so generously to have you both (Tom and Rozann) in our lives. Teresa and José María. Likewise, with the recognition for his talent, ingenuity, brilliance, energy and friendliness of his disciples of the "Zaragoza Multicriteria Decision Making Group". It has been an honor to work together. Finally, for his enormous contribution to the field of Decision Sciences, the eternal memory of the "Spanish Multicriteria Decisión Making Group".
Posted by Patrick Harker on 19th August 2017
Tom Saaty changed my life. First, by being the father of the smartest, kindest, most loving woman in the world I am privileged to call my wife, Emily. He welcomed me with open arms and hugs into his family (even though I had to take a math test to prove to him and my professors at Penn that I was worthy of his daughter!). He also changed my life through his life's work on decision making that I was lucky enough to learn from him and then publish. He taught me through example how a man dedicated to his scholarship (and he is indeed the epitome of a scholar) can also be a loving father and friend. Lastly, he changed all of our lives. His theory of decision making and modeling will surely pass the test of time as it is truly the work of a genius. His love of people, his belly-aching laughter after a good joke, his dedication to a more peaceful world will be missed by all. I miss him dearly. And I wish I were a fly on the walls of Heaven as he argues with God about life, tries to convince Him that the eigenvector method is the way to go, and tells Him a few good jokes where they laugh together for eternity.
Posted by Hussein Najee on 19th August 2017
Met this unique person even though I am not academia and don’t know anything about AHP, Decision making, Creative thinking and all his sciences. Unique in a sense that he used to come down to my level and relates to my life and understands my inner self whenever I visit. He made an indelible mark in my life by making me understand myself more and accept things. And he was lucky to have Rozann; they complement each other. He leaves so much behind him that he continues to live inside me.
Posted by Eduardo Martinez on 18th August 2017
Tom was a remarkable person, full of charm, talent, creativity and energy, and always ready to share his valuable knowledge and experience. Visiting him and lovely Rozann, having endless conversations and being shown wonderful places in Pittsburgh left precious memories forever. Tom will always be present to thousands of people around the globe, who had the privilege of meeting him. It was a great honour to meet both Tom and Rozann. We will always miss him. Eduardo Martinez, PhD (UNESCO)
Posted by Omar Alkahily on 18th August 2017
Learned a lot from tom, he didn't like being called Mr, doctor or professor. That was the first lesson on the first day of meeting him when I was around 13 years old. Continued learning from him and inspired by him every time we met. In his presence, you are entertained by his humor, awed by his knowledge and humbled by his generosity. Learned a lot from you Tom. Thank you.

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