Eamon Joseph O'Brien was an American actor of stage, screen, and television, and film director. His career spanned almost 40 years, and he won one Academy Award, two Golden Globe Awards, and two stars on the Hollywood Walk of Fame.

A Double Life is a 1947 American film noir which tells the story of an actor whose mind becomes affected by the character he portrays. It stars Ronald Colman and Signe Hasso. It is directed by George Cukor, with screenplay by Ruth Gordon and Garson Kanin. Ronald Colman won the Academy Award for Best Actor for his performance in this film.