His television credits include: Max Headroom, Dallas (as Brett Lomax), Falcon Crest, Baywatch, Murder, She Wrote, Lois and Clark: The New Adventures of Superman, JAG, Charmed, The Young and the Restless, Swamp Thing, and The Langoliers. He played Chief Officer Henry Tingle Wilde in the 1997 film Titanic. A Paramount internal memo dated from 1987 has revealed that Chapman was once considered for the part of Data in Star Trek: The Next Generation.