Stuart Blumberg (born 16 July 1969, Cleveland, Ohio) is an American screenwriter, producer, director, and occasional actor. He graduated from Yale University with a BA in History in 1991, where he roomed with actor Edward Norton. He began his career writing for MADtv (1996) before moving into feature screenwriting. He is married to actress Mia Moross (m. 2017). He was nominated for the Academy Award for Best Original Screenplay for The Kids Are All Right (2010). His most notable work as writer and/or director includes Keeping the Faith (2000) (Edward Norton, Ben Stiller), The Girl Next Door (2004) (Elisha Cuthbert, Emile Hirsch), The Kids Are All Right (2010) (Julianne Moore, Annette Bening), and his directorial debut Thanks for Sharing (2012) (Mark Ruffalo, Gwyneth Paltrow). His only credited acting role in a major film is Car Salesman in Fight Club (1999) (Brad Pitt, Edward Norton).