Although he is best known for his regular Gilmore Girls role, he also has several television show guest appearance credits, including Angel; 3rd Rock from the Sun; Yes, Dear; True Jackson, VP; Andy Richter Controls the Universe; and Bunheads.
In 2003, Gunn starred in the featurette The Man Who Invented the Moon, directed by fellow Goodman School of Drama alum and Gilmore Girls cast member John Cabrera.