Trustee Society of America Historians, since 1972, president, 1981-1984. Trustee Gilman School, Baltimore, 1962-1980, Council Authors Guild, Inc., 1966-1972, Council Authors League, 1972-1983, secretary, 1975-1980. Trustee New York State Maritime Museum, 1968-1979, South St. Seaport Museum, since 1980, Ocean Liner Museum, since 1982.
Member advisory board Protect Historic American. Member Society of America Historians, Authors Guild, American Society of Composers Clubs: 14 W. Hamilton St. (Baltimore). Century Association (New York City).