Advisory director Metropolitan Opera Association, 1989-1902. Chairman board directors St. Luke's Chamber Ensemble, 1988-1901, chairman emeritus, since 2001. President Society Friends of Touro Synagogue, 2002-2003.
Chair Touro Synagogue Foundation, 2003-2006. 1st lieutenant Judge Advocate General Corps, Army of the United States, 1953-1955. Member of American Bar Association (vice chairman section taxation 1974-1977, chairman-elect 1981-1982, chairman 1982-1983, chairman commission taxpayer compliance 1983-1988, House of Delegates 1988-1991, section taxation Distinguished Service award 2003), American Law Institute (chairman tax program committee 1988—2010, John Minor Wisdom award 1995), Association Bar City of New York (executive committee 1974-1978, chairman executive committee 1977-1978, vice president 1978-1979, chairman taxation committee 1979-1981, chairman government ethics committee 1988-1990), New York State Bar Association, The Parks Council (board directors 1995-1997), Human Rights First since 1986, (treasurer 1997—2002), Council Foreign Relations, East Hampton History Society (trustee 1983-1989, 1990-1995), Foundation for a Civil Society (board directors since 1994, vice chairman 1997-1998, chairman 1999—2006), Guild Hall (trustee 1989-1994, treasurer 1993-1994, 1995—2002, trustee 1995—2003), Metropolitan Club, Century Association, India House, Phi Beta Kappa.