Paul Edward Valentine Giamatti (; born June 6, 1967) is an American actor. He was nominated for an Academy Award for Best Supporting Actor for the film Cinderella Man and is also known for his roles in the films  Private Parts,  Sideways, American Splendor, The Illusionist, Cold Souls, Barney's Version, Big Fat Liar, Love & Mercy, Straight Outta Compton, and Win Win, as well as the miniseries John Adams. He has won a Golden Globe Award and two Screen Actors Guilds Awards.