American physicist known for his discovery of anti-protons, a sub-atomic antiparticle. He was an outspoken critic of the Vietnam War and he was one of 21 Nobel Laureates who signed the Humanist Manifesto in 2003.
He was in college at Berkeley when he joined the Manhattan Project.
He joined the Manhattan Project, research and development project that produced the first atomic bombs during World War II, in 1942.
He got married to Beatrice Babette Copper in 1943 and had four children with her.
Like Niels Bohr, he earned a Nobel Prize in physics for his discovery.