<Tr> <Th> Children </Th> <Td> </Td> </Tr> <Tr> <Th> Website </Th> <Td> brianposehn.com </Td> </Tr> <P> Brian Edmund Posehn (born July 6, 1966) is an American actor, voice actor, musician, writer, and comedian, 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 has a recurring role on The Big Bang Theory as geologist Bert Kibbler . </P> <P> Posehn was born and raised in Sacramento, California . He is of German and Irish descent . He graduated from Sonoma Valley High School in 1984 . He attended college at California State University, Sacramento . </P>

Who is the geologist on big bang theory
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