William Joseph Devane (born September 5, 1937) is an American film, television and theater actor.
Devane was born in Albany, New York, the son of Joseph (Joe) Devane, who was Franklin D. Roosevelt's chauffeur when he was Governor of New York. Devane graduated from the American Academy of Dramatic Arts in New York.
In 1966, Devane portrayed Robert Kennedy in the Off-Broadway spoof MacBird. He gained acclaim for his role as President John F. Kennedy in a TV movie about the Cuban Missile Crisis, The Missiles of October (1974), and again when he played blacklisted radio personality John Henry Faulk in the Emmy Award-winning TV movie, Fear on Trial (1975). He is widely known for his ten years as the villainous Greg Sumner on Knots Landing