[citation needed] During his production of the 1994 public television special Positive Thinking: The Norman Vincent Peale Story, Duncan and co-producer David Crouse interviewed five American presidents: Richard Nixon, Jimmy Carter, Gerald Ford, George H. W. Bush and Ronald Reagan.
Duncan's production of the 1996 13-part television series Mystic Lands, about spiritual places of the world, debuted on Discovery Networks.
In 1999, Duncan produced and directed Through One City's Eyes, an in-depth campaign on race relations that included a nationwide public television broadcast, a seven-part public radio series, a two-part classroom series for middle school students, and a traveling photo museum.
Working with photojournalist Mohamed Amin, Abdul recorded the sounds of genocide, war, revolution, anarchy and famine in Ethiopia, Eritrea, Kenya, Sudan, Somalia and Rwanda.
His photographic work heavily features people from Afghanistan, Ethiopia, Peru, Sudan, Ghana, Colombia, Pakistan and Kenya.
He is a board member for the Juneau Icefield Research Program, a trustee for the Loisaba Community Conservation Foundation, and an advisor to the World Peace Festival in Berlin and the America's Black Holocaust Museum in Milwaukee, Wisconsin.