J. Robert Oppenheimer: 15 Frequently Asked Questions

J. Robert Oppenheimer (1904-1967) was an American theoretical physicist who served as the scientific director of the Manhattan Project during World War II, leading the effort that produced the first nuclear weapons. Born in New York City to a wealthy family, he studied at Harvard, Cambridge, and Gottingen, becoming one of America's foremost theoretical physicists in the 1930s. After the war, he became a central figure in debates over nuclear arms policy, advocating for international control of atomic energy. His subsequent persecution during the McCarthy era — when his security clearance was revoked in a humiliating 1954 hearing — transformed him into a symbol of the tension between scientific achievement, moral responsibility, and political power.

The Manhattan Project was the secret American research program that developed the first nuclear weapons during World War II. Launched in 1942 under the U.S. Army Corps of Engineers, it employed over 125,000 people at its peak and cost approximately $2 billion (roughly $30 billion in today's dollars). Oppenheimer was appointed scientific director of the weapons laboratory at Los Alamos, New Mexico, where he recruited and managed a team of the world's top physicists including Enrico Fermi, Niels Bohr, Richard Feynman, and Hans Bethe. The project produced two types of atomic bombs: a uranium gun-type weapon (Little Boy) dropped on Hiroshima and a plutonium implosion weapon (Fat Man) dropped on Nagasaki in August 1945. The bombings killed an estimated 200,000 people and forced Japan's surrender, ending the war but ushering in the nuclear age.