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Actor · Acting

Mark Harmon

Born 1951-09-02
📍 Burbank, California, USA

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.

Filmography 97

Freakier Friday
as Ryan
2025
NCIS: Origins
as Older Leroy Jethro Gibbs (voice) (uncredited)
2024
NCIS: Origins
as Older Leroy Jethro Gibbs (uncredited)
2024
NCISverse: The First 1,000
as Self
2024
Joe Montana: Cool Under Pressure
as Self - Narrator (voice)
2022
The Kelly Clarkson Show
as Self
2019
The Wild
as Self
2019
All or Nothing: The Michigan Wolverines
as Narrator (voice)
2018
The American West
as Self
2016
The Late Show with Stephen Colbert
as Self - Guest
2015
The Late Late Show with James Corden
as Self
2015
NCIS: New Orleans
as Leroy Jethro Gibbs
2014
The Arsenio Hall Show
as Self
2013
Certain Prey
as Lucas Davenport
2011
Justice League: Crisis on Two Earths
as Superman (voice)
2010
Weather Girl
as Dale
2009
The Bonnie Hunt Show
as Self
2008
The Megan Mullally Show
as Self - Guest
2006
Chasing Liberty
as James Foster
2004
NCIS
as Leroy Jethro Gibbs
2003
Freaky Friday
as Ryan
2003
Jimmy Kimmel Live!
as Self
2003
Local Boys
as Jim Wesley
2002
The Legend of Tarzan
as Bob Markham (voice)
2001
And Never Let Her Go
as Thomas Capano
2001
And Never Let Her Go
as Thomas Capano
2001
Crossfire Trail
as Bruce Barkow
2001
The Amati Girls
as Lawrence
2001
For All Time
as Charles Lattimer
2000
The West Wing
as Simon Donovan
1999
I'll Remember April
as John Cooper
1999
Family Guy
as Leroy Jethro Gibbs (voice)
1999
Fear and Loathing in Las Vegas
as Magazine Reporter
1998
From the Earth to the Moon
as Wally Schirra
1998
The View
as Self
1997
Casualties
as Tommy Nance
1997
The First to Go
as Jeremy Hampton
1997
The Rosie O'Donnell Show
as Self
1996
JAG
as Leroy Jethro Gibbs
1995
Charlie Grace
as Charlie Grace
1995
The Last Supper
as Dominant Male
1995
Magic in the Water
as Jack Black
1995
Original Sins
as Johnathan Franye
1995
Chicago Hope
as Jack McNeil
1994
Natural Born Killers
as Mickey Knox in TV
1994
Wyatt Earp
as Sheriff Johnny Behan
1994
Harts of the West
1993
Cold Heaven
as Alex Davenport
1992
The Tonight Show with Jay Leno
1992
Reasonable Doubts
as Det. Dicky Cobb
1991
Till There Was You
as Frank Flynn
1991
Shadow of a Doubt
as Charles Spencer
1991
Long Road Home
as Ertie Robertson
1991
Fourth Story
as David Shepard
1991
Dillinger
as John Dillinger
1991
Worth Winning
as Taylor Worth
1989
Sweet Bird of Youth
as Chance Wayne
1989
Stealing Home
as Billy Wyatt
1988
The Presidio
as Jay Austin
1988
After the Promise
as Elmer Jackson
1987
Dear America: Letters Home from Vietnam
as (voice)
1987
Summer School
as Mr. Freddy Shoop
1987
Let's Get Harry
as Harry
1986
The Deliberate Stranger
as Ted Bundy
1986
The Deliberate Stranger
as Ted Bundy
1986
Prince of Bel Air
as Robin Prince
1986
Moonlighting
as Sam Crawford
1985
Tuareg: Desert Warrior
as Gacel Sayah
1984
Intimate Agony
as Tommy
1983
St. Elsewhere
as Robert Caldwell
1982
Goliath Awaits
as Peter Cabot
1981
Entertainment Tonight
as Self
1981
Flamingo Road
as Field Carlyle
1981
Flamingo Road
as Fielding Carlyle
1980
The Dream Merchants
as Johnny Edge
1980
240-Robert
as Thib Thibideaux
1979
Beyond the Poseidon Adventure
as Larry Simpson
1979
Comes a Horseman
as Billy Joe Meynert
1978
Centennial
as Captain John McIntosh
1978
Little Mo
as Norman Brinker
1978
Getting Married
as Howie Lesser
1978
Sam
as Mike Breen
1978
The Love Boat
as Doug Bradbury
1977
The Hardy Boys / Nancy Drew Mysteries
1977
All's Fair
1976
Delvecchio
as Ronnie Striker
1976
Laverne & Shirley
1976
Saturday Night Live
as Self - Host
1975
Police Woman
as Stanski
1974
Police Woman
as Paul Donin
1974
Sonic Boom
as Student Controller
1974
Emergency!
as Ofcr. Dave Gordon
1972
Adam-12
as Officer Gus Corbin
1968
The Tonight Show Starring Johnny Carson
as Self
1962
Hallmark Hall of Fame
as Charles
1951
Golden Globe Awards
as Self - Nominee
1944
Golden Globe Awards
as Self
1944