Thomas F. Wilson (born April 15, 1959) is an American actor, writer, musician, painter, voice-over artist and stand-up comedian. He is best known for playing Biff Tannen, as well as his grandson Griff Tannen and great-grandfather Buford "Mad Dog" Tannen in the Back to the Future trilogy and Coach Ben Fredricks on NBC's Freaks and Geeks.
On Nickelodeon, he is best known for playing Flats the flounder and the Tattletale Strangler on SpongeBob SquarePants. In addition, he voiced several minor characters for The SpongeBob SquarePants Movie and voiced a coach in an episode of Zoey 101. He also voiced Krowser Krebs in an episode of Back at the Barnyard.