Mark Harmon
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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
Freakier Friday (2025)
as Ryan
Natural Born Killers (1994)
as Mickey Knox in TV
Wyatt Earp (1994)
as Sheriff Johnny Behan
Freaky Friday (2003)
as Ryan
Fear and Loathing in Las Vegas (1998)
as Magazine Reporter
And Never Let Her Go (2001)
as Thomas Capano
Summer School (1987)
as Mr. Freddy Shoop
Justice League: Crisis on Two Earths (2010)
as Superman (voice)
Stealing Home (1988)
as Billy Wyatt
The Presidio (1988)
as Jay Austin
Chasing Liberty (2004)
as James Foster
Beyond the Poseidon Adventure (1979)
as Larry Simpson
Crossfire Trail (2001)
as Bruce Barkow
After the Promise (1987)
as Elmer Jackson
Cold Heaven (1992)
as Alex Davenport
The Last Supper (1995)
as Dominant Male
Dear America: Letters Home from Vietnam (1987)
as (voice)
Certain Prey (2011)
as Lucas Davenport
Let's Get Harry (1986)
as Harry
Weather Girl (2009)
as Dale
For All Time (2000)
as Charles Lattimer
Local Boys (2002)
as Jim Wesley
Little Mo (1978)
as Norman Brinker
The Deliberate Stranger (1986)
as Ted Bundy
Worth Winning (1989)
as Taylor Worth
Magic in the Water (1995)
as Jack Black
Prince of Bel Air (1986)
as Robin Prince
Flamingo Road (1980)
as Fielding Carlyle
Comes a Horseman (1978)
as Billy Joe Meynert
Tuareg: Desert Warrior (1984)
as Gacel Sayah
The Wild (2019)
as Self
Sonic Boom (1974)
as Student Controller
Sweet Bird of Youth (1989)
as Chance Wayne
Fourth Story (1991)
as David Shepard
Original Sins (1995)
as Johnathan Franye
Intimate Agony (1983)
as Tommy
Eleanor and Franklin: The White House Years (1977)
as Robert Dunlap
Shadow of a Doubt (1991)
as Charles Spencer
NCISverse: The First 1,000 (2024)
as Self
Dillinger (1991)
as John Dillinger
Long Road Home (1991)
as Ertie Robertson
The Amati Girls (2001)
as Lawrence
I'll Remember April (1999)
as John Cooper
Till There Was You (1991)
as Frank Flynn
The First to Go (1997)
as Jeremy Hampton
Getting Married (1978)
as Howie Lesser
Casualties (1997)
as Tommy Nance
Intimate Portrait: Pam Dawber (2002)
as Self