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.\n\nBased on this passage, who plays the voice of mack in cars? Let's have some stream of consciousness first.
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The relevant information to answer the above question is: 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. So, the answer is John Dezso Ratzenberger.
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