Topics include: d'Espagnat's interest in quantum mechanics foundations, since the beginning of his career; the International School of Physics, held in Varenna, 29th June - 11th July 1970, which was organized and directed by D'Espagnat with the theme "Foundations of Quantum Mechanics;." the origins of Aspect's experiments on Bell's inequalities. Prominently mentioned are: J. S. Bell, J. F. Clauser, Toraldo di Francia, A. Shimony, E. Wigner, Leon Rosenfeld, Antonio Zicchichi, A. Aspect, A. Whightman, Loouis de Broglie, Costa de Beauregard, and David Bohm.