Board directors CEEB, 1955-1959, Catalyst, 1961-1973, United Negro College Fund, 1967-1972, Near East Foundation, 1975-1984, International Schools Services, 1976-1982, Solebury School, 1975-1983. Program chairman Salzburg Seminar, 1971, member advisory council, 1997. Founding trustee Questar Library.
Science and Art, 1982-2004, president, 1996-1999, 2002-2005. President Delaware River Mill Society, 1992-1997, emeritus, 1997-2005. Member American Association Advancement of Humanities (board directors 1979-1983), Grolier Club, Century Association (New York City), Cosmos Club (Washington), Elizabethan Club, Berzelius (New Haven), Phi Beta Kappa.