Albert Einstein and Robert Oppenheimer signed bamboo walking stick. Albert Einstein, the Father of Theoretical Physics, and Robert Oppenheimer, Father of the Atomic Bomb, two great men of science and physics would change the world with their theories and with their collaboration that led to The Manhattan Project. On the eve of World War II, Einstein endorsed a letter to President Franklin D. Roosevelt alerting him to the potential development of "extremely powerful bombs of a new type" and recommending that the U.S. begin similar research. Robert Oppenheimer, 1904 - 1967, American theoretical physicist and wartime head of the Los Alamos Laboratory at The Manhattan Project during World War II, developed the first nuclear weapons used in the atomic bombings that ended the war. After World War II, in 1947, Robert Oppenheimer became Director of the Institute for Advanced Study at Princeton University, from 1947 to 1966. Albert Einstein, who in 1933 had accepted a position at Princeton as well, worked in that Advanced Study Institute with Oppenheimer from 1947 to 1955. It was signed for a staff member at Princeton University on the campus.