
Mark Harmon
Thomas Mark Harmon (born September 2, 1951) is an American actor, producer and director. He is known for playing the lead role of Leroy Jethro Gibbs on NCIS (2003-2021), a role which has earned him six nominations at the People's Choice Awards including a win for Favorite TV Crime Drama Actor in 2017. Since 2008, he has also been a producer and executive producer of the show as well as its' spinoff series NCIS: New Orleans. His character of NCIS special agent Leroy Jethro Gibbs was introduced in a guest starring role in two episodes of JAG, and continued on the spinoff show NCIS.
He had a recurring role as Secret Service special agent Simon Donovan in a four-episode story arc in The West Wing in 2002, for which he received an Emmy Award nomination.
One of his first national TV appearances (other than as an athlete) was in a commercial for Kellogg's Product 19 cereal with his father, Tom Harmon, its longstanding TV spokesman. Thanks to his sister Kristin's in-laws, Ozzie and Harriet Nelson, he landed his first job as an actor in an episode of Ozzie's Girls.
He has been starring in television and film since the mid-1970s, after a career as a collegiate football player with the UCLA Bruins.
He's been married to actress Pam Dawber since 1987 and they have 2 sons. His son, actor Sean Harmon, had a recurring role as a young Leeroy Jethro Gibbs on NCIS.
Known For










Credits
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Freakier Friday 2025Ryan★ NR
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NCIS: Origins 2024Older Leroy Jethro Gibbs (uncredited)★ 7.4
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Self★ 9
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Self - Narrator (voice)★ 6.5
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The Wild 2019Self★ 7
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Narrator (voice)★ 7.5
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The American West 2016Self★ 6.7
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NCIS: New Orleans 2014Leroy Jethro Gibbs★ 7.3
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Certain Prey 2011Lucas Davenport★ 4.8
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Clark Kent / Superman (voice)★ 7.3
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Weather Girl 2009Dale★ 5.6
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Chasing Liberty 2004James Foster★ 6.2
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NCIS 2003Leroy Jethro Gibbs★ 7.6
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Freaky Friday 2003Ryan★ 6.5
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Local Boys 2002Jim Wesley★ 6.4
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Self★ NR
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The Legend of Tarzan 2001Bob Markham (voice)★ 6.8
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And Never Let Her Go 2001Thomas Capano★ 6.6
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Crossfire Trail 2001Bruce Barkow★ 6.3
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The Amati Girls 2001Lawrence★ 2.5
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For All Time 2000Charles Lattimer★ 6.3
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The West Wing 1999Simon Donovan★ 8.3
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I'll Remember April 1999John Cooper★ 6.3
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Family Guy 1999Leroy Jethro Gibbs (voice)★ 7.4
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Magazine Reporter★ 7.2
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Wally Schirra★ 8.1
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Casualties 1997Tommy Nance★ 6.6
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The First to Go 1997Jeremy Hampton★ NR
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JAG 1995Leroy Jethro Gibbs★ 7.3
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Charlie Grace 1995Charlie Grace★ NR
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The Last Supper 1995Dominant Male★ 6.6
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Magic in the Water 1995Jack Black★ 5.4
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Original Sins 1995Johnathan Franye★ 7
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Chicago Hope 1994Jack McNeil★ 7.2
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Natural Born Killers 1994Mickey Knox in TV★ 7.1
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Wyatt Earp 1994Sheriff Johnny Behan★ 6.8
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Harts of the West 1993★ 6.2
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Cold Heaven 1992Alex Davenport★ 4.6
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Reasonable Doubts 1991Det. Dicky Cobb★ 7.2
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Till There Was You 1991Frank Flynn★ 3.3
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Shadow of a Doubt 1991Charles Spencer★ 5.2
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Long Road Home 1991Ertie Robertson★ 5.3
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Fourth Story 1991David Shepard★ 5.6
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Dillinger 1991John Dillinger★ 4.5
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Worth Winning 1989Taylor Worth★ 5.2
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Sweet Bird of Youth 1989Chance Wayne★ 5.8
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Stealing Home 1988Billy Wyatt★ 6.3
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The Presidio 1988Jay Austin★ 5.9
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After the Promise 1987Elmer Jackson★ 7.7
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(voice)★ 7.1
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Summer School 1987Mr. Freddy Shoop★ 6.4
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Let's Get Harry 1986Harry★ 6.2
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Ted Bundy★ 6.5
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Prince of Bel Air 1986Robin Prince★ 5.1
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Moonlighting 1985Sam Crawford★ 7.5
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Gacel Sayah★ 5.8
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Intimate Agony 1983Tommy★ 4.3
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St. Elsewhere 1982Robert Caldwell★ 5.5
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Goliath Awaits 1981Peter Cabot★ 6.8
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Flamingo Road 1980Fielding Carlyle★ NR
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The Dream Merchants 1980Johnny Edge★ 4.5
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240-Robert 1979Thib Thibideaux★ 5.5
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Larry Simpson★ 5
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Comes a Horseman 1978Billy Joe Meynert★ 6
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Centennial 1978Captain John McIntosh★ 7.6
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Little Mo 1978Norman Brinker★ 7.5
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Getting Married 1978Howie Lesser★ 4
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Sam 1978Mike Breen★ NR
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The Love Boat 1977Doug Bradbury★ 6.3
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Robert Dunlap★ 5.1
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★ 7.1
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All's Fair 1976★ 7
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Delvecchio 1976Ronnie Striker★ NR
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Laverne & Shirley 1976★ 7.2
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Police Woman 1974Stanski★ 6.2
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Sonic Boom 1974Student Controller★ 4.5
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Ozzie's Girls 1973★ 6.7
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Emergency! 1972Ofcr. Dave Gordon★ 7.8
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Adam-12 1968Officer Gus Corbin★ 7
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Charles★ 8.6