Brian Posehn (born on July 6, 1966 in Sacramento, California) is an American actor and stand-up comedian, best known for his roles as mail clerk Kevin Liotta on 'Just Shoot Me!' and as a cast member of HBO's 'Mr. Show.' He currently costars on Comedy Central's 'The Sarah Silverman Program.' Posehn considers himself to be a nerd (he likes comic books), and many of his stand-up bits center around nerd-related self-deprecation. He also considers himself to be a "metal nerd," and has a growing fanbase in the metal community.