Symposium in honor of Gregory Breit on the occasion of his retirement from Yale University. Symposium speeches by: M. H. Hull, "Nucleon-Nucleon Forces;" H. A. Bethe, "Nuclear Matter;" E. P. Wigner, "Nuclear Reactions;" D. A. Bromley, "Heavy Ion Interactions;" V. W. Hughes, "The Breit Interaction;" G. E. Brown, "Isotope Shifts;" R. G. Herb, "Proton-proton Scattering;" and M. A. Tuve, "Early Works in Nuclear and Geophysics." Banquet addresses by: J. A. Wheeler, H. Margenau, I. I. Rabi, V. Weisskopf, and G. Breit. Breit's speech includes recollections of physicists: Einstein, Ehrnfest, Bohr, Lawrence. He is critical of contemporary physicists involved in public relations and organizations.