While at Los Alamos, David was first my collaborator, then also my postdoc, and always my inseparable friend, from whom I learnt invaluable scientific and personal traits that are still with me today. He had a remarkable presence of competency, perfection, and warmth in everything from science, to political and philosophical discussions, to food and art, and even to lifting weights, which was a significant part of our weekly routine. I am professionally proud to have been part of David's early career, and I am immensely grateful for his close friendship, which he readily extended to my family and our cat. As our careers eventually took us in different geographic directions it was expected that we would naturally reconnect and reunite one day. The anticipation of that day always gave a bright outlook. The change in this outlook has left a deep void.
David, you will be sorely missed by many, including me.