Member Westchester County Play Land Commission, 1978-1981, Westchester Community Mental Health Board, 1975-1978. Fellow American College Trial Lawyers (president 1997-1998), International Academy Trial Lawyers. Member American Bar Association, Anti-Defamation League (member national legal affairs committee and New York regional board since 1996), New York State Bar Association (chairman federal legislation committee 1980-1984), Association of Bar of City of New York (criminal court committee 1963-1966, civil rights committee 1966-1969, judiciary committee 1976-1980), Federal Bar Council, New York State Lawyers Association (chairman federal legislation committee 1971-1973).
Partner Spengler, Carlson, Gubar, Brodsky & Frischling, New York City, 1976-1993, Proskauer Rose, New York City, from 1993. Member civil division United States Department Justice, 1957-1958. Special attorney Attorney General's Special Group Organized Crime, 1958-1959.
Assistant United States attorney United States District Court (southern district) New York, 1959-1962. Chief special prosecutions division United States Attorney' General’ s Office, 1961-1962. Member New York City Water Board, 1995-1998, New York City Economic Development Corporation, since 1997.
Associate editor New York University Law Review, 1956-1957. Columnist New York Law Journal, since 1972. Member national advisory board Professional Liability Reporter, 1977-1978.
Member editorial advisory board Securities Regulation Law Journal, since 1977. Member editorial board The Tax Shelter Advisor, 1984-1989, Rico Law Reporter. Contributor articles to professional journals.