Committee. Having replaced Seth Neddermeyer as lead on the implosion program, Kistiakowsky had over 600 people working on the problem by the spring of 1945.
Under his leadership, they were able to develop the complex explosive lenses needed to compress the plutonium sphere uniformly to achieve critical mass.
After the war, Kistiakowsky returned to Harvard. His advised several presidents on arms control and foreign policy. He retired from Havard as professor emeritus in 1972 and he died in 1982.
