His career dates to early commercial television, where he started as production coordinator on the musical show "Easy Does It." In 1951, Colman became assistant to the director for "Kraft Television Theatre" and later worked on such series as "Robert Montgomery Presents" and "Colgate Comedy Hour."
As a TV executive, Colman oversaw the pilot of "The Many Lives of Dobie Gillis" and worked on "Green Acres" and "Hawaii Five-O."
In the 1970s, he helped develop "The Love Boat," where he worked as line producer. Colman also produced the 1980s series "Hotel."