Correspondence, memoranda, journals, speeches, drafts of books and articles, notes, charts, graphs, patent, biographical material, family papers, printed materials, newspaper clippings, photos, and other materials, relating chiefly to Von Neumann's career as professor of mathmatics at the Institute for Advanced Study, Princeton, N. J., including his directorship of the Electronic Computer Project; adviser and commissioner of the U. S. Atomic Energy Commission; scientific consultant to government and private concerns, including the Los Alamos Scientific Laboratory, Los Alamos, N. M., and the U. S. Army Ballistic Research Laboratory, Aberdeen, Md.; and author of works on ballistic research, computers, continuous geometries, logic, operator theory, quantum mechanics, and the theory of games. Includes evaluations of his work written after his death by colleagues including Herman Heine Goldstine, Paul R. Halmos, and Abraham H. Taub. Of special interest are an Albert Einstein letter and report on theoretical physics (1937). Also includes a small amount of material pertaining to Eva and Peter Aldor. Correspondents include: Eva Aldor, Frank Aydelote, Hans Albrecht Bethe, Garrett Birkhoff, S. Chandrasekhar, George Bernard Dantzig, P. A. M. Dirac, Carl Eckart, Enrico Fermi, Abraham Flexner, George Gamow, Kurt Gd̲el, Herman Hein Goldstine, Werner Heisenberg, L. van Hove, Cuthbert Hurd, Pascual Jordan, R. H. Kent, George H. Kistiakowsky, Oskar Morgenstern, J. Robert Oppenheimer, Rudolf Ortvay, Wolfgang Pauli, Marshall H. Stone, Lewis L. Strauss, Abraham H. Taub, Edward Teller, Stanislaw M. Ulam, Klara Dan Von Neumann, Oswald Veblen, Warren Weaver, Hermann Weyl, Norbert Weiner, and Eugene Paul Wigner.