Furthermore, in 1985, 1986 and 1992, he appeared on three episodes of Cheers as Walt Twitchell, a mailman who got into minor altercations with Cliff Clavin. Birk reprised the role of Twitchell in a 2002 episode of the Cheers spinoff series, Frasier, in which the title character (played by Kelsey Grammer) returned to Boston and re-acquainted himself with old friends from the bar. He played a recurring role on Coach as Riley Pringle from 1989 to 1993. He also appeared in an episode of Mr. Belvedere as an accordion player.