He starred in television series and in television movies and was known mainly for portraying military personnel, especially officers. His best known television role was in the 1980s series "The A-Team" as Colonel Roderick Decker—a United States Army colonel who tried to catch the fugitive Vietnam veterans. He played the role of Colonel Decker from 1983 to 1986. He also had a recurring role in another 1980s hit television series, "Magnum, P.I.", as a United States Marine Corps colonel, Colonel "Buck" Greene.