Includes transcription and tapes of a November 19, 1965 interview relating to his decision to come to Illinois, Milo Ketchum, Worth Rodebush, family background, Newton High School and Harvard, the development of modern physics, rebuilding and recruiting a faculty at Illinois, theoretical physicists, College of Engineering, Champaign-Urbana, cyclotrons, spectroscopy, P. Gerald Kruger, betatrons, Leland Haworth, Robert Serber, Donald Kerst, Gilberto Bernardini, Maurice Goldhaber, Polykarp Kusch, research at Bell Telephone and General Electric, World War I work in anti-aircraft ballistics, a sabbatical in England before World War II, the Radiation Laboratory at M.I.T., radar, staffing the Laboratory and writing its history, relations with industrial firms and the federal government, the atomic bomb project, Harold Mott-Smith, Louis Ridenour, the Control Systems Laboratory, Frederick Seitz and John Bardeen. Includes correspondence (1932-33, 1945-76) for Loomis' work as Associate Director of the Radiation Laboratory (1941-46) at M.I.T. and director of the Lincoln Laboratory (1951-52) at Cambridge, Mass. about administrative matters, Systems Laboratory, National Academy of Sciences (Section of Physics), the Naval Office of Ordnance Research and Operations Evaluation Group, the Oppenheimer security clearance case, cooperative curriculum development, a speech on "The Future of Physics" (1949) and publications (1920-59) relating to atomic physics and molecular spectroscopy (1920-40), Louis N. Ridenour, the Bulletin of the Atomic Scientists (1950), management of research institutions and the Radiation Laboratory.