Profile photo of John Ratzenberger

John Ratzenberger

John Dezso Ratzenberger is an American actor, voice actor, director, producer, writer and entrepreneur. He is one of the most successful actors of all time in terms of box-office receipts. Ratzenberger is best known for portraying Cliff Clavin on the popular comedy series Cheers, for which he earned two Primetime Emmy nominations. He is the only voice actor to appear in every Pixar Animation Studios feature film, including Hamm in the Toy Story franchise, The Underminer in The Incredibles franchise, and Mack in the Cars franchise. 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, a role he portrayed throughout the show's eleven seasons. His first Pixar role was the voice of Hamm in Toy Story, 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.

Filmography

2025
Tapawingo

as Tom Roan

Movie
2015
Inside Out

as Fritz (voice)

Movie
1995
Toy Story

as Hamm (voice)

Movie
2001
Monsters, Inc.

as Yeti (voice)

Movie
2006
Cars

as Mack / Hamm Truck / Abominable Snow Plow / P.T. Flea Car (voice)

Movie
2004
The Incredibles

as Underminer (voice)

Movie
2008
WALL·E

as John (voice)

Movie
2024
Inside Out 2

as Fritz (voice)

Movie
2026
Toy Story 5

as Hamm (voice)

Movie
2003
Finding Nemo

as Fish School (voice)

Movie
2007
Ratatouille

as Mustafa (voice)

Movie
2017
Cars 3

as Mack (voice)

Movie
1999
Toy Story 2

as Hamm (voice)

Movie
2009
Up

as Construction Foreman Tom (voice)

Movie
2013
Monsters University

as Yeti (voice)

Movie
2016
Finding Dory

as Husband Crab (Bill) (voice)

Movie
1998
A Bug's Life

as P.T. Flea (voice)

Movie
2012
Brave

as Gordon (voice)

Movie
2022
Luck

as Rootie (voice)

Movie
2017
Coco

as Juan Ortodoncia (voice)

Movie
2010
Toy Story 3

as Hamm (voice)

Movie