Duncan served as chief of staff to New Hampshire governor
Hugh Gallen until the latter's death in 1982. In 1984, he served as deputy national press secretary for
Walter Mondale's presidential campaign, and in 1988, as national press secretary for
Michael Dukakis's presidential campaign. In 1998, President Clinton appointed him chair of the American Heritage Rivers Advisory Committee and Secretary of Interior Bruce Babbitt appointed him as a director of the National Park Foundation. ==Screenwriting==