Joseph Chapman (actor)Joseph Chapman is an American film and television actor. He is known for playing the villainous character Mark St. Claire in the American soap opera television series Knots Landing.CareerChapman guest-starred in television programs including Airwolf, Riptide (American [TV series)|Riptide] and Hill Street Blues. He also appeared in the 1984 film Crimes of [Passion (1984 film)|Crimes of Passion]. Chapman starred in the television miniseries Favorite Son. His final credit was from the medical drama television series Providence.FilmographyTelevision