John RatzenbergerJohn Dezső Ratzenberger (born April 6, 1947) is an American actor. He is one of the most successful actors of all time in terms of box-office receipts. Ratzenberger portrayed Cliff Clavin on the comedy series ''Cheers'', for which he earned two Primetime Emmy nominations. He has voiced a character in each of the first 22 Pixar Animation Studios feature films, including Hamm in the ''Toy Story'' franchise, The Abominable Snowman in the ''Monsters, Inc.'' franchise, Mack in the ''Cars'' franchise and The Underminer in ''The Incredibles'' franchise.
Born in Bridgeport, Connecticut, Ratzenberger began his entertainment career while living in London in the 1970s. He had minor film and television roles throughout the late 70s and early 1980s before creating, and then landing, the role of the know-it-all mailman Cliff Clavin on ''Cheers'' (1982–1993), a role he portrayed throughout the show's eleven seasons. His first Pixar role was the voice of Hamm in ''Toy Story'' (1995), and he has voiced Pixar characters in films and video games ever since.
From 2004 to 2008, he hosted the TV documentary series ''Made in America''. Outside of acting, he has promoted American entrepreneurship and manufacturing, and campaigned for several Republican candidates. Provided by Wikipedia