I would like to express my gratitude to the American Physical Society and also to the Bell Telephone Laboratories for inviting me to come over to this meeting and giving me the opportunity to be present at this session tonight. I need not say how closely connected my father felt to the community of physicists in this country. He came to the United States for the first time forty years ago and returned with increasing frequency as the activities here in the field of atomic and nuclear physics underwent such a rapid and great expansion. Both he and my mother, who often came with him, felt deeply attached to this country where they found so many close friends.