Poston had regular roles on many other television series: Family Matters, Murphy Brown, Home Improvement, Cosby, Malcolm & Eddie, ER, Grace Under Fire, That '70s Show (as Kitty Forman's father, Burt Sigurdson), Will & Grace, and guest starred in an episode of The Simpsons as the Capital City Goofball. He played dentist/jeweler, Art Hibke, on ABC's Coach, for which he was nominated for an Emmy for Outstanding Guest Actor in a Comedy Series in 1991. He guest-starred on Home Improvement as a surly airport clerk in Alpena, Michigan when Tim and Al get stuck there during a snowstorm on Christmas Eve, and again as that character's brother in the episode "The Tool Man Delivers", and again as the third brother in the episode “Thanksgiving”.