<Tr> <Th> Children </Th> <Td> </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.ratzenberger.com </Td> </Tr> <P> John Dezso Ratzenberger (born April 6, 1947) is an American actor, voice actor, and entrepreneur . He is best known as Cliff Clavin in Cheers . He is also known for his extensive vocal work in Pixar Animation Studios' films, notably Hamm in the Toy Story franchise and Mack in the Cars franchise . </P> <P> Ratzenberger was born in Bridgeport, Connecticut, the son of Bertha Veronica (née Grochowski), who worked for Remington Arms, and Dezso Alexander Ratzenberger, a Texaco truck driver . His father was of Austrian and Hungarian descent, and his mother was of Polish ancestry . He attended St. Ann's School in Bridgeport and Sacred Heart University in Fairfield, Connecticut . In 1969, Ratzenberger was a tractor operator at the Woodstock Festival . He moved to London in 1971 and stayed there for 10 years . </P>

Who plays the abominable snowman in monsters inc