​From Wikipedia, the free encyclopedia.   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. He is of Armenian heritage.[citation needed] His brother, Tom Mardirosian, is also an actor. Clark made numerous appearances in film and television, particularly in the 1970s and 1980s. Two of his best-known characters were John Doe#6 on the NBC drama St. Elsewhere,a likeable and humorous psychi