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Mark Harmon

Acting 74 years old Burbank, California, USA ★ 3.9
Born: September 2, 1951

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.

External Links

🎬 IMDb

Known For

NCIS
NCIS Leroy Jethro Gibbs 2003
Family Guy
Family Guy Leroy Jethro Gibbs (voice) 1999
JAG
JAG Leroy Jethro Gibbs 1995
The Love Boat
The Love Boat Doug Bradbury 1977
The West Wing
The West Wing Simon Donovan 1999

Filmography

Acting Credits (102)

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

Directing Credits (2)

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