Tribute by Ash Carter, Director, Belfer Center for Science and International Affairs at Harvard Kennedy School, United States Secretary of Defense (2015-2017)

β€œTo ministers and heads of state, he was a sought-after adviser, pointing the way toward reforms that boosted farm yields, educational standards, and economic prosperity. To the scientific community, he was an unstinting champion of innovation and rigorous evidence. To his students, he was a passionate teacher and mentor.”