Biography
Born 09/02/1951
Mark Harmon’s breakout role in “St. Elsewhere” (NBC, 1982-88) launched the actor as a major eighties heartthrob, leaving him to enjoy decades of solid roles in crime and medical dramas before aging handsomely and authoritatively into military investigator Leroy Jethro Gibbs on the CBS sleeper...
Mark Harmon's biography
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