Mark Harmon is an American actor. Since the mid 1970s, he has appeared in a variety of television, film and stage roles following a brief career as a collegiate football player with the UCLA Bruins. Since 2003, Harmon has starred as Leroy Jethro Gibbs in the hit CBS series NCIS. Harmon was born Thomas Mark Harmon in Burbank, California. His father was University of Michigan football All-American and Heisman Trophy winner, Tom Harmon. His mother was actress and artist, Elyse Knox . Harmon has two older sisters, actress and painter Kristin Nelson, the former wife of singer Ricky Nelson, and... actress-model Kelly Harmon, who was once married to car magnate John DeLorean. After attending Los Angeles Pierce College as a student and quarterback, Harmon transferred to the University of California, Los Angeles, and following in his father's athletic footsteps was the starting quarterback for the UCLA Bruins football team in 1972 and 1973. In UCLA's 1972 season he engineered a stunning upset of the two-time defending national champion, Nebraska Cornhuskers.
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