A group of physicists at a 1946 Los Alamos colloquium. Front row, left to right: Norris Bradbury, John Manley, Enrico Fermi, J.M.B. Kellogg. Second row, left to right: Colonel Oliver G. Haywood, unknown, J. Robert Oppenheimer, Richard Feynman, Phil B. Porter. Third row, left to right: Edward Teller, Gregory Breit, Arthur Hemmendinger Arthur Schelberg.