Transcript of tape recorded interviews conducted by Charles Weiner, Center for History of Physics, American Institute of Physics. Covers his youth and early education; undergraduate study at California Institute of Technology and influence of Arthur A. Noyes and Linus Pauling; graduate work in physics at Princeton University, especially molecular beam research with Karl T. Compton, Edward U. Condon and Robert J. Van de Graaff; career with the Physics Department and the Radiation Laboratory of the University of California, Berkeley, and relationship with Ernest O. Lawrence and J. Robert Oppenheimer; World War II research on radar, sonar and the automic bomb; postwar development of accelerators; and receipt of the Nobel prize in 1951.