Mark Harmon

• Birthplace: Burbank, California
• Birthday: September 2, 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 hit “NCIS” (CBS, 203-). The former college football star’s appeal as a regular, laid back guy found a steadier audience on prime time, however, than on the big screen -- with the exception of leading roles in comedies like “Summer School” (…more