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Personal Info
Known For
Acting
Birthday
September 2, 1951
Place of Birth
Burbank, California, USA
Also Known As
- Thomas Mark Harmon
- مارک هارمون
- مارک هارمُن
Mark Harmon
4.8 Popularity
Biography
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
6.8
Ryan
Freakier Friday
2025
7.6
Older Leroy Jethro Gibbs (voice) (uncredited)
NCIS: Origins
2024
7.6
Older Leroy Jethro Gibbs (uncredited)
NCIS: Origins
2024
9.0
Self
NCISverse: The First 1,000
2024
6.5
Self - Narrator (voice)
Joe Montana: Cool Under Pressure
2022
6.3
Self
The Kelly Clarkson Show
2019
7.0
Self
The Wild
2019
7.5
Narrator (voice)
All or Nothing: The Michigan Wolverines
2018
6.7
Self
The American West
2016
5.3
Self
The Late Late Show with James Corden
2015
Credits
Freakier Friday
as Ryan
2025
6.8
NCIS: Origins
as Older Leroy Jethro Gibbs (voice) (uncredited)
2024
7.6
NCIS: Origins
as Older Leroy Jethro Gibbs (uncredited)
2024
7.6
NCISverse: The First 1,000
as Self
2024
9.0
Joe Montana: Cool Under Pressure
as Self - Narrator (voice)
2022
6.5
The Kelly Clarkson Show
as Self
2019
6.3
The Wild
as Self
2019
7.0
All or Nothing: The Michigan Wolverines
as Narrator (voice)
2018
7.5
The American West
as Self
2016
6.7
The Late Late Show with James Corden
as Self
2015
5.3
NCIS: New Orleans
as Leroy Jethro Gibbs
2014
7.3
The Arsenio Hall Show
as Self
2013
5.7
Certain Prey
as Lucas Davenport
2011
4.9
Justice League: Crisis on Two Earths
as Superman (voice)
2010
7.3
Weather Girl
as Dale
2009
5.6
The Bonnie Hunt Show
as Self
2008
4.4
The Megan Mullally Show
as Self - Guest
2006
4.2
🎬
The Tony Danza Show
as Self
2004
6.1
Chasing Liberty
as James Foster
2004
6.2
NCIS
as Leroy Jethro Gibbs
2003
7.6
Freaky Friday
as Ryan
2003
6.6
Jimmy Kimmel Live!
as Self
2003
5.5
Local Boys
as Jim Wesley
2002
6.3
🎬
Intimate Portrait: Pam Dawber
as Self
2002
0.0
The Legend of Tarzan
as Bob Markham (voice)
2001
6.9
And Never Let Her Go
as Thomas Capano
2001
7.0
And Never Let Her Go
as Thomas Capano
2001
6.6
Crossfire Trail
as Bruce Barkow
2001
6.3
The Amati Girls
as Lawrence
2001
2.5
For All Time
as Charles Lattimer
2000
6.3
The West Wing
as Simon Donovan
1999
8.2
I'll Remember April
as John Cooper
1999
6.3
Family Guy
as Leroy Jethro Gibbs (voice)
1999
7.4
Fear and Loathing in Las Vegas
as Magazine Reporter
1998
7.2
From the Earth to the Moon
as Wally Schirra
1998
8.1
The View
as Self
1997
4.3
Casualties
as Tommy Nance
1997
6.4
The First to Go
as Jeremy Hampton
1997
0.0
The Rosie O'Donnell Show
as Self
1996
3.9
JAG
as Leroy Jethro Gibbs
1995
7.3
Charlie Grace
as Charlie Grace
1995
0.0
The Last Supper
as Dominant Male
1995
6.5
Magic in the Water
as Jack Black
1995
5.3
Original Sins
as Johnathan Franye
1995
3.3
Chicago Hope
as Jack McNeil
1994
7.2
Natural Born Killers
as Mickey Knox in TV
1994
7.1
Wyatt Earp
as Sheriff Johnny Behan
1994
6.8
Harts of the West
1993
6.2
Cold Heaven
as Alex Davenport
1992
4.3
The Tonight Show with Jay Leno
1992
5.4
Reasonable Doubts
as Det. Dicky Cobb
1991
7.2
Till There Was You
as Frank Flynn
1991
2.8
Shadow of a Doubt
as Charles Spencer
1991
5.2
Long Road Home
as Ertie Robertson
1991
5.3
Fourth Story
as David Shepard
1991
5.0
Dillinger
as John Dillinger
1991
4.7
Worth Winning
as Taylor Worth
1989
5.2
Sweet Bird of Youth
as Chance Wayne
1989
5.4
Stealing Home
as Billy Wyatt
1988
6.3
The Presidio
as Jay Austin
1988
5.9
After the Promise
as Elmer Jackson
1987
7.6
Dear America: Letters Home from Vietnam
as (voice)
1987
7.1
Summer School
as Mr. Freddy Shoop
1987
6.4
Let's Get Harry
as Harry
1986
6.2
The Deliberate Stranger
as Ted Bundy
1986
6.2
The Deliberate Stranger
as Ted Bundy
1986
0.0
Prince of Bel Air
as Robin Prince
1986
4.7
Moonlighting
as Sam Crawford
1985
7.5
Tuareg: Desert Warrior
as Gacel Sayah
1984
4.9
Intimate Agony
as Tommy
1983
4.3
St. Elsewhere
as Robert Caldwell
1982
5.6
Goliath Awaits
as Peter Cabot
1981
6.8
Entertainment Tonight
as Self
1981
4.1
Flamingo Road
as Field Carlyle
1981
6.1
The Dream Merchants
as Johnny Edge
1980
4.5
Flamingo Road
as Fielding Carlyle
1980
0.0
240-Robert
as Thib Thibideaux
1979
5.5
Beyond the Poseidon Adventure
as Larry Simpson
1979
5.1
Comes a Horseman
as Billy Joe Meynert
1978
6.1
Centennial
as Captain John McIntosh
1978
7.7
Little Mo
as Norman Brinker
1978
7.5
Getting Married
as Howie Lesser
1978
4.0
Sam
as Mike Breen
1978
0.0
The Love Boat
as Doug Bradbury
1977
6.3
🎬
Eleanor and Franklin: The White House Years
as Robert Dunlap
1977
4.4
The Hardy Boys / Nancy Drew Mysteries
1977
7.1
All's Fair
1976
7.0
Delvecchio
as Ronnie Striker
1976
0.0
Laverne & Shirley
1976
7.2
Saturday Night Live
as Self - Host
1975
7.0
Police Woman
as Stanski
1974
6.2
Police Woman
as Paul Donin
1974
6.2
Sonic Boom
as Student Controller
1974
4.5
🎬
Ozzie's Girls
1973
6.7
Emergency!
as Ofcr. Dave Gordon
1972
7.8
Adam-12
as Officer Gus Corbin
1968
7.0
The Tonight Show Starring Johnny Carson
as Self
1962
7.5
Hallmark Hall of Fame
as Charles
1951
8.6
Golden Globe Awards
as Self - Nominee
1944
7.2
Golden Globe Awards
as Self
1944
7.2