Christopher Haden-Guest, 5th Baron Haden-Guest (born February 5, 1948), is an American-British screenwriter, composer, musician, director, actor, and comedian. Guest is most widely known in Hollywood for having written, directed, and starred in his series of comedy films shot in mock-documentary (mockumentary) style. Many scenes and character backgrounds in Guest's films are written and directed, although actors have no rehearsal time and the ensemble improvise scenes while filming them. The series of films began with This Is Spinal Tap (which he did not direct) and continued with Waiting for Guffman, Best In Show, A Mighty Wind, For Your Consideration, and Mascots.
For Nickelodeon, he guest-starred as Stanley S. SquarePants in the SpongeBob SquarePants episode of the same name.