led him to Los Alamos, where  he served as the chief of the theoretical division for the Atomic Bomb Project.

At the end of the Second World War, Bethe worked, along with Edward Teller, on the development of the hydrogen bomb. He was a member of the President’s Science Advisory Committee from 1956-1964, and in 1958 headed a presidential study of nuclear disarmament. He helped to negotiate the 1963 partial test ban treaty with the Soviet Union, and acted as an informal advisor to Presidents Eisenhower, Kennedy, and Johnson.