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.
Filmography (99)
Freakier Friday
2025
NCISverse: The First 1,000
2024
NCIS: Origins
2024
Joe Montana: Cool Under Pressure
2022
The Wild
2019
The Kelly Clarkson Show
2019
All or Nothing: The Michigan Wolverines
2018
The American West
2016
The Late Late Show with James Corden
2015
The Late Show with Stephen Colbert
2015
NCIS: New Orleans
2014
The Arsenio Hall Show
2013
Certain Prey
2011
Justice League: Crisis on Two Earths
2010
Weather Girl
2009
The Bonnie Hunt Show
2008
The Megan Mullally Show
2006
Chasing Liberty
2004
The Tony Danza Show
2004
Freaky Friday
2003
Jimmy Kimmel Live!
2003
NCIS
2003
Local Boys
2002
Intimate Portrait: Pam Dawber
2002
Crossfire Trail
2001
And Never Let Her Go
2001
The Amati Girls
2001
The Legend of Tarzan
2001
And Never Let Her Go
2001
For All Time
2000
I'll Remember April
1999
The West Wing
1999
Family Guy
1999
Fear and Loathing in Las Vegas
1998
From the Earth to the Moon
1998
Casualties
1997
The First to Go
1997
The View
1997
The Rosie O'Donnell Show
1996
Strangers
1996
Original Sins
1995
Magic in the Water
1995
The Last Supper
1995
JAG
1995
Charlie Grace
1995
Wyatt Earp
1994
Natural Born Killers
1994
Chicago Hope
1994
Harts of the West
1993
Cold Heaven
1992
The Tonight Show with Jay Leno
1992
Shadow of a Doubt
1991
Dillinger
1991
Long Road Home
1991
Till There Was You
1991
Fourth Story
1991
Reasonable Doubts
1991
Worth Winning
1989
Sweet Bird of Youth
1989
The Presidio
1988
Stealing Home
1988
Summer School
1987
Dear America: Letters Home from Vietnam
1987
After the Promise
1987
The Deliberate Stranger
1986
Prince of Bel Air
1986
Let's Get Harry
1986
The Deliberate Stranger
1986
Moonlighting
1985
Tuareg: Desert Warrior
1984
Intimate Agony
1983
St. Elsewhere
1982
Flamingo Road
1981
Goliath Awaits
1981
Entertainment Tonight
1981
Flamingo Road
1980
The Dream Merchants
1980
Beyond the Poseidon Adventure
1979
240-Robert
1979
Getting Married
1978
Comes a Horseman
1978
Little Mo
1978
Centennial
1978
Sam
1978
Eleanor and Franklin: The White House Years
1977
The Love Boat
1977
The Hardy Boys / Nancy Drew Mysteries
1977
Laverne & Shirley
1976
All's Fair
1976
Delvecchio
1976
Saturday Night Live
1975
Sonic Boom
1974
Police Woman
1974
Ozzie's Girls
1973
Emergency!
1972
Adam-12
1968
The Tonight Show Starring Johnny Carson
1962
Hallmark Hall of Fame
1951
Golden Globe Awards
1944
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