He is best known as Chet Hunter on Boy Meets World and Harry "The Hardware Store Guy" on Home Improvement.

[citation needed] Clark is a veteran of the Vietnam War,[1] having served as a first lieutenant in the United States Army with the 5th Infantry Division.

Deeds, Eight Crazy Nights, 50 First Dates, I Now Pronounce You Chuck & Larry, Bedtime Stories, Grown Ups, and That's My Boy.

[1] He has also made guest appearances in numerous television series, including Home Improvement, Boy Meets World, The Jamie Foxx Show, The Drew Carey Show, Girl Meets World, and Community.

Starting with Toy Story 3, Clark has voiced Slinky Dog in the Toy Story franchise, in place of his close friend Jim Varney, Slinky's original voice actor in the first two films, who died of lung cancer on February 10, 2000.