-----Mull was born in Chicago, and raised in North Ridgeville, Ohio. He studied painting, earning a Master of Fine Arts in painting from the Rhode Island School of Design. He then turned to comedy.
Following a period of stand-up comedy performances and humorous song recordings including opening for Frank Zappa at Austin's Armadillo World Headquarters in 1973 and for Bruce Springsteen at the Shady Grove Music Fair in Gaithersburg, Maryland.
In October 1974, his first famous role was as twins Garth Gimble and Barth Gimble in the television nighttime absurdist soap opera Mary Hartman, Mary Hartman in 1976. This led to the spin-off comedy talk shows Fernwood 2-Night the next year, followed by America 2-Night, in which he played Barth Gimble as talk show host, opposite Fred Willard as sidekick Jerry Hubbard.
Despite devoting himself full time to painting, he still appears in many TV shows and movies.
Press link below to view You Tube video:
-- "The Humming Song"