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.
Ratzenberger was a house framer living in London when he began his career in the performing arts.Through the 1970s, he performed with Ray Hassett as the comedic theatrical duo Sal's Meat Market, which toured across the UK.
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