Brian Edmund Posehn is an American stand-up comedian, actor, voice actor, musician, and writer. He is known for his roles as Jim Kuback on The WB's Mission Hill and Brian Spukowski on Comedy Central's The Sarah Silverman Program. He also had a recurring role on The Big Bang Theory as geologist Bert Kibbler. Posehn's major contribution to comics is being the co-writer on Gerry Duggan's acclaimed first Deadpool run.