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Brian Edmund Posehn is an American actor, voice actor, musician, writer, and comedian, who, for Disney, voiced Cousin Larry in the Disney Channel animated series Kim Possible and voiced additional characters in the 2003 Disney animated feature film Brother Bear, the 2005 English dub in Pom Poko, and Lobster Claws in Disney XD's Star vs. the Forces of Evil. He also played Dr. Cork in the Disney Channel sitcom The Suite Life on Deck and Gorkager on the Disney XD animated comedy Billy Dilley's Super-Duper Subterranean Summer. He then made a cameo as a Speeder Pilot in The Mandalorian.

Born in Sacramento, California, he graduated from Sonoma Valley High School in 1984 and attended college at California State University, Sacramento. Posehn began his career with mostly small roles on television. He is best known for voicing Jim Kuback in The WB animated series Mission Hill from 1999 to 2002, and for his role as Brian Damien Spukowski in the Comedy Central comedy series The Sarah Silverman Program. He also appeared in 15 episodes of The Big Bang Theory as Bert Kibbler and as the voice of Sour Cream in Steven Universe.

In films, Posehn appeared in Dumb and Dumberer: When Harry Met Lloyd, Grind, The Devil's Rejects, Sleeping Dogs Lie, Fantastic Four: Rise of the Silver Surfer, and Surf's Up.

One of his trademarks is his deadpan stoner voice, which he has used for all of his Disney characters.