<P> John Dezso Ratzenberger ( born April 6 , 1947 ) is an American actor , voice actor , and entrepreneur . He is known for playing Cliff Clavin in the TV show Cheers , for which he earned two Emmy nominations . He is also known for his extensive voice roles in Pixar Animation Studios ' films , such as Hamm in the Toy Story franchise and Mack in the Cars franchise . He is the only actor to appear in all of Pixar 's feature films , and with minor appearances in major films such as Superman and The Empire Strikes Back , is one of the most successful actors of all time in terms of box - office receipts . </P>
<P> John Dezso Ratzenberger ( born April 6 , 1947 ) is an American actor , voice actor , and entrepreneur . He is known for playing Cliff Clavin in the TV show Cheers , for which he earned two Emmy nominations . He is also known for his extensive voice roles in Pixar Animation Studios ' films , such as Hamm in the Toy Story franchise and Mack in the Cars franchise . He is the only actor to appear in all of Pixar 's feature films , and with minor appearances in major films such as Superman and The Empire Strikes Back , is one of the most successful actors of all time in terms of box - office receipts . </P>
who does the voice of mack in cars 3
who does the voice of mack in cars 3
John Dezso Ratzenberger
John Dezso Ratzenberger