Brian Posehn (born July 6, 1966) is an American comedian who has appeared on shows like Mr. Show with Bob and David (alongside Tom Kenny) and Clerks: The Animated Series. These roles effectively cemented his role in popular geekdom.
In the realm of voice acting, he's provided voices for Aqua Teen Hunger Force, Tom Goes to the Mayor, Mission Hill, and Kim Possible. He currently appears on The Sarah Silverman Program as Brian, and participated in the Comedians of Comedy tour and TV show alongside Patton Oswalt.
Despite all this, he's probably best known for his appearances on Just Shoot Me, although few people will actually admit watching it.