James Gilmore "Jim" Backus (February 25, 1913 – July 3, 1989) was an American radio, television, film, and voice actor. Among his most famous roles are the voice of nearsighted cartoon character Mr. Magoo, the rich Hubert Updike III on the radio version of The Alan Young Show, Joan Davis's character's husband (a domestic court judge) on TV's I Married Joan, James Dean's character's father in Rebel Without a Cause and Thurston Howell, III on the 1960s sitcom Gilligan's Island.