in the 1976 television nighttime absurdist soap opera Mary Hartman, Mary Hartman. This led to work in the spin-off comedy talk shows Fernwood 2 Night (1977) and America 2-Night (1978), in which he played talk show host Barth Gimble (Garth Gimble's twin brother), opposite Fred Willard, as sidekick Jerry Hubbard. Mull also played the neurotic disc jockey Eric Swan in the 1978 movie FM, his feature film debut. In 1979, Mull appeared in the Taxi episode Hollywood Calling. He created, wrote for and starred in the short-lived 1984 CBS sitcom Domestic Life, with Megan Follows playing his teenaged daughter. In one episode of The Golden Girls, he played a hippie who was afraid of the outside world. He had a long-running role as Leon Carp, Roseanne Conner's gay boss (and later business partner) on the TV series Roseanne. During the 1980s, Mull played supporting roles in the films Mr. Mom and Clue, and had a rare lead role in Serial. He also starred in a series of commercials for Michelob and Pizza Hut, and in a series of television and radio commercials for Red Roof Inn with Fred Willard. He appeared in the Pecos Bill episode of the Shelley Duvall TV series Tall Tales & Legends. He also did the voice of Vlad Masters/Vlad Plasmius, the main villain in Danny Phantom. From 1996-2001, Mull played Willard Kraft on the show Sabrina the Teenage Witch as her principal. Mull has appeared as a guest star on the game show Hollywood Squares, appearing as the center square in the show's final season, from 2003 to 2004. In late 2004 and in 2013's Netflix-produced Season 4, he portrayed Gene Parmesan, a private investigator, on the TV series Arrested Development. During 2008 and 2009, Mull guest starred in two episodes of the television series Gary Unmarried, as Allison's father. Mull also starred in the Fox sitcoms Dads and The Cool Kids, the latter with David Alan Grier, Vicki Lawrence, and Leslie Jordan. Artistic career Mull has been a painter since the 1970s, and his work has appeared in group and solo exhibits. He participated in the June 15, 1971 exhibit "Flush with the Walls" in the men's room of the Boston Museum of Fine Arts to protest the lack of contemporary and local art in the museum. His work often combines photorealist painting, and the pop art and collage styles. He published a book