Acting · Burbank, California, USA · Born September 2, 1951
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.
MovieFreakier Friday
2025
as Ryan
TVNCIS: Origins
2024
as Older Leroy Jethro Gibbs (voice) (uncredited)
MovieNCISverse: The First 1,000
2024
as Self
TVBlack Tar
2022
as Ira Monroe
TVJoe Montana: Cool Under Pressure
2022
as Self - Narrator (voice)
TVThe Kelly Clarkson Show
2019
as Self
MovieThe Wild
2019
as Self
TVAll or Nothing: The Michigan Wolverines
2018
as Narrator (voice)
TVThe American West
2016
as Self
TVThe Late Show with Stephen Colbert
2015
as Self - Guest
TVThe Late Late Show with James Corden
2015
as Self
TVNCIS: New Orleans
2014
as Leroy Jethro Gibbs
TVThe Arsenio Hall Show
2013
as Self
MovieCertain Prey
2011
as Lucas Davenport
MovieJustice League: Crisis on Two Earths
2010
as Superman (voice)
MovieWeather Girl
2009
as Dale
TVThe Bonnie Hunt Show
2008
as Self
TVThe Megan Mullally Show
2006
as Self - Guest
The Tony Danza Show
2004
as Self
MovieChasing Liberty
2004
as James Foster
TVNCIS
2003
as Leroy Jethro Gibbs
MovieFreaky Friday
2003
as Ryan
TVJimmy Kimmel Live!
2003
as Self
MovieLocal Boys
2002
as Jim Wesley
Intimate Portrait: Pam Dawber
2002
as Self
TVThe Legend of Tarzan
2001
as Bob Markham (voice)
MovieAnd Never Let Her Go
2001
as Thomas Capano
TVAnd Never Let Her Go
2001
as Thomas Capano
MovieCrossfire Trail
2001
as Bruce Barkow
MovieThe Amati Girls
2001
as Lawrence
MovieFor All Time
2000
as Charles Lattimer
TVThe West Wing
1999
as Simon Donovan
MovieI'll Remember April
1999
as John Cooper
TVFamily Guy
1999
as Leroy Jethro Gibbs (voice)
MovieFear and Loathing in Las Vegas
1998
as Magazine Reporter
TVFrom the Earth to the Moon
1998
as Wally Schirra
TVThe View
1997
as Self
MovieCasualties
1997
as Tommy Nance
MovieThe First to Go
1997
as Jeremy Hampton
TVThe Rosie O'Donnell Show
1996
as Self
TVStrangers
1996
as Mark
TVJAG
1995
as Leroy Jethro Gibbs
TVCharlie Grace
1995
as Charlie Grace
MovieThe Last Supper
1995
as Dominant Male
MovieMagic in the Water
1995
as Jack Black
MovieOriginal Sins
1995
as Johnathan Franye
TVChicago Hope
1994
as Jack McNeil
MovieNatural Born Killers
1994
as Mickey Knox in TV
MovieWyatt Earp
1994
as Sheriff Johnny Behan
TVHarts of the West
1993
MovieCold Heaven
1992
as Alex Davenport
TVThe Tonight Show with Jay Leno
1992
TVReasonable Doubts
1991
as Det. Dicky Cobb
MovieTill There Was You
1991
as Frank Flynn
MovieShadow of a Doubt
1991
as Charles Spencer
MovieLong Road Home
1991
as Ertie Robertson
MovieFourth Story
1991
as David Shepard
MovieDillinger
1991
as John Dillinger
MovieWorth Winning
1989
as Taylor Worth
MovieSweet Bird of Youth
1989
as Chance Wayne
MovieStealing Home
1988
as Billy Wyatt
MovieThe Presidio
1988
as Jay Austin
MovieAfter the Promise
1987
as Elmer Jackson
MovieDear America: Letters Home from Vietnam
1987
as (voice)
MovieSummer School
1987
as Mr. Freddy Shoop
MovieLet's Get Harry
1986
as Harry
MovieThe Deliberate Stranger
1986
as Ted Bundy
TVThe Deliberate Stranger
1986
as Ted Bundy
MoviePrince of Bel Air
1986
as Robin Prince
TVMoonlighting
1985
as Sam Crawford
MovieTuareg: Desert Warrior
1984
as Gacel Sayah
MovieIntimate Agony
1983
as Tommy
TVSt. Elsewhere
1982
as Robert Caldwell
TVGoliath Awaits
1981
as Peter Cabot
TVEntertainment Tonight
1981
as Self
TVFlamingo Road
1981
as Field Carlyle
MovieFlamingo Road
1980
as Fielding Carlyle
TVThe Dream Merchants
1980
as Johnny Edge
TV240-Robert
1979
as Thib Thibideaux
MovieBeyond the Poseidon Adventure
1979
as Larry Simpson
MovieComes a Horseman
1978
as Billy Joe Meynert
TVCentennial
1978
as Captain John McIntosh
MovieLittle Mo
1978
as Norman Brinker
MovieGetting Married
1978
as Howie Lesser
TVSam
1978
as Mike Breen
TVThe Love Boat
1977
as Doug Bradbury
Eleanor and Franklin: The White House Years
1977
as Robert Dunlap
TVThe Hardy Boys / Nancy Drew Mysteries
1977
TVAll's Fair
1976
TVDelvecchio
1976
as Ronnie Striker
TVLaverne & Shirley
1976
TVSaturday Night Live
1975
as Self - Host
TVPolice Woman
1974
as Stanski
MovieSonic Boom
1974
as Student Controller
Ozzie's Girls
1973
TVEmergency!
1972
as Ofcr. Dave Gordon
TVAdam-12
1968
as Officer Gus Corbin
TVThe Tonight Show Starring Johnny Carson
1962
as Self
TVHallmark Hall of Fame
1951
as Charles
TVGolden Globe Awards
1944
as Self - Nominee
