<Tr> <Th> Occupation </Th> <Td> Actor </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1998--present </Td> </Tr> <P> Kevin Sussman (born December 4, 1970) is an American actor . He is known for playing Stuart Bloom on the CBS sitcom The Big Bang Theory and Walter on the ABC comedy - drama Ugly Betty . Starting with the sixth season of The Big Bang Theory, he was promoted to a series regular . </P> <P> Kevin Sussman is one of four brothers, born to Jewish parents . He attended the College of Staten Island for one year and went on to graduate from the American Academy of Dramatic Arts in Manhattan . He later studied with acting teacher Uta Hagen for four years . </P>

Who plays stuart in the big bang theory