On which WWII project did Richard Feynman work at Los Alamos?

Richard Feynman worked on the Manhattan Project at Los Alamos during World War II. The secret American-led program developed the first atomic bombs, combining military organization with research by physicists, chemists, engineers, and mathematicians.

Feynman joined the project in 1943 after completing his doctoral work at Princeton. He worked in Hans Bethe’s Theoretical Division and eventually led a group of human computers performing calculations for nuclear-weapons research. He also helped develop computational methods using IBM punched-card machines and contributed to calculations involving neutron behavior and bomb efficiency.

Although Feynman was famous for his later work in quantum electrodynamics, his wartime role was practical and classified. He was not the project’s overall director; that role belonged to J. Robert Oppenheimer, the scientific director of Los Alamos. Feynman also visited Oak Ridge, where he advised on safety procedures for enriched uranium. The Apollo Program and Human Genome Project came later, while Operation Paperclip concerned the recruitment of German scientists after the war.