Eastwood was nominated for Oscars for his acting in Unforgiven and Million Dollar Baby and won Best Director for both.
The former Richie Cunningham has had great success behind the camera. See A Beautiful Mind and Frost/Nixon for proof.
The famed actor directed 1980's Oscar-winning Ordinary People, but his work has been a mixed bag since then.
Having worked steadily as an actor since the fifties, Reiner also directed greats like This Is Spinal Tap and Misery.
The comedian earned an enduring reputation for his participation in films like The Great Dictator, Modern Times, and The Gold Rush.
Both Gone Baby Gone and The Town have been rapturously received by critics; Affleck's acting career -- not so much.
After bombing in The Godfather: Part III, Coppola went on to be the first American woman to nab a directing Oscar nom, for Lost in Translation.
Throughout his life, Pollack starred in both his own movies and those directed by others, like Tootsie and Eyes Wide Shut.
Not content to be matinee-idol handsome, Clooney went behind the camera for Confessions of a Dangerous Mind.
With four well-received features under his belt -- including Into The Wild and The Pledge -- Penn has never stopped acting.