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Martin Mull was born in 1943. He is an American actor, comedian, painter, and musician. Mull is best known for his roles as Barth Gimble in the television series Fernwood 2 Night and Martin Morgenstern in the sitcom Roseanne. He has also appeared in numerous films, including My Bodyguard (1980), Clue (1985), and Mr. Mom (1983).