Offbeat funnyman Martin Mull was born on August 18, 1943, in Chicago, Illinois, the eldest of three children of Betty, an actress and director, and Harold Mull, a carpenter. He was raised in Ohio. The blond-maned, blue-eyed comedian with the sad, droopy mustache first came in contact with the arts by honing in on his innate talents as a painter. In order to pay his art school tuition, he started organizing bands. At around the same time, he discovered that stand-up comedy was another way to allow his creative juices to flow.

Martin's early recognition as a humorist led to a recording contract, and, over the years, he would be Grammy-nominated several times for a number of eccentric comedy albums. His gimmick and allure came in the form of a dry, humorless delivery and a bland, highly conservative-looking demeanor, which masked a witty and subversive philosophy.

Gaining popularity in the 1970s, he finally broke into TV in the cult soap opera parody Mary Hartman, Mary Hartman (1976) in which he played Garth Gimble, a volatile wife abuser who got his comeuppance when he was impaled by a star on an aluminum Christmas tree in his home closet. Mull was so popular on the show that he was resurrected in the spin-off series Fernwood Tonight (1977) as twin brother Barth Gimble, who was a co-host of the town's television program along with Fred Willard's Jerry Hubbard character.

After this peak, Martin became a sought-after guest on the talk show circuit, not to mention variety specials and TV movies. He tried his hand at producing and starring in his own sitcom Domestic Life (1984) but the series failed. He also added his special brand of merriment to films over the years, some of them being decent, such as FM (1978), Serial (1980), Mr. Mom (1983) and Clue (1985) in the role of the tweedy-looking Colonel Mustard, while most have been either formula shtick or just plain drivel, as in Take This Job and Shove It (1981), Rented Lips (1987), which he produced and wrote, Cutting Class (1989), Far Out Man (1990) (with Cheech & Chong), and Mr. Write (1994).

Martin's extensive TV credits include starring roles in the comedy series His & Hers (1990) co-starring Stephanie Faracy as a fellow doctor; and The Jackie Thomas Show (1992) starring Tom Arnold; and recurring comedy roles including a restaurant boss in the hit "domestic goddess" series Roseanne (1988); a principal in Sabrina the Teenage Witch (1996); a high school teacher in The Ellen Show (2001); plus 'Til Death (2006), Life in Pieces (2015), I'm Sorry (2017), Arrested Development (2003), The Cool Kids (2018) and The Ranch (2016). He lent his voice to the animated comedies Family Dog (1993), Teamo Supremo (2002), Danny Phantom (2003) and American Dad! (2005). Newer film credits included featured roles in The Year That Trembled (2002), Come Away Home (2005), Relative Strangers (2006), Killers (2010), And They're Off (2011) and A Futile and Stupid Gesture (2018).

Martin's first passion was art. His work appeared in galleries throughout the world. He authored the book "Painting, Drawing and World", a compilation of ten years of his work. Mull was married to composer/musician Wendy Haas; their daughter is Maggie Mull.