Thomas Mark Harmon was born on September 2, 1951, in Burbank, California, to football player and broadcaster Tom Harmon and actress and artist Elyse Knox (née Kornbrath). Harmon played college football and found success as one of TV's hunkiest actors. While many of his roles have relied on good looks, Harmon was impressive on St. Elsewhere (1982) as the suave doctor who contracted AIDS.

His sisters are Kelly Harmon, the Tic Tac model; and Kristin Nelson, a painter and ex-wife of musician Ricky Nelson. He is the uncle of musicians Matthew Nelson and Gunnar Nelson of the band Nelson, and actress Tracy Nelson. In 1987, Harmon and his wife, actress Pam Dawber, sued his sister Kristin Nelson, for custody of her youngest son, Sam.

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Mark Harmon and Dennis Kort in 240-Robert (1979)

Joanna Cassidy, Mark Harmon, and John Bennett Perry in 240-Robert (1979)

Mark Harmon and Marlee Matlin in Reasonable Doubts (1991)

Mark Harmon and Emily Wickersham in NCIS (2003)

Mark Harmon, Nike Doukas, and Diona Reasonover in NCIS (2003)

Wilmer Valderrama, Rocky Carroll, Gary Cole, Katrina Law, Sean Murray, Brian Dietzen, and Diona Reasonover in NCIS (2003)

Matthew Goode and Mandy Moore in Chasing Liberty (2004)

Jamie Lee Curtis and Lindsay Lohan in Freaky Friday (2003)

Mark Harmon(I)

Mark Harmon(I)

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