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Oliver Clark

Oliver Clark (born January 4, 1939) is an American character actor.

Clark was born Richard Mardirosian in Buffalo, New York, the son of Afro (née Karahos) and Matthew Mardirosian.[http://www.filmreference.com/film/20/Tom-Mardirosian.html Tom Mardirosian Biography (1947-)] He is of Armenian heritage. His brother, Tom Mardirosian, is also an actor. Clark made numerous appearances in film and television, particularly in the 1970s and 1980s. One of his best known characters was John Doe #6 on the NBC drama St. Elsewhere. Doe #6 was a likeable and humorous psychiatric patient.

Source: Wikipedia