Kevin Sussman is an American actor and comedian. In 1998, he debuted in an episode of Ghost Stories. He next made his big screen debut in the film Liberty Heights. In the 2000s, he landed roles in such films as Almost Famous, Wet Hot American Summer, Pipe Dream, Changing Lanes, Sweet Home Alabama, Little Black Book, and Hitch. He then became known for his role as Walter on the TV series Ugly Betty. Since 2009, he plays the role of Stuart Bloom on the CBS sitcom The Big Bang Theory. He also reprised his role as Steve on the TV series Wet Hot American Summer: First Day of Camp.