
Mark Harmon
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.
64Credits34 TV · 30 films
1951–2026Years activefirst to latest
10.0 Highest ratedFlamingo Road
6.9 Average ratingacross 63 titles
Top TV shows 34best Mark Harmon shows
- 1
Hallmark Hall of FameCharles · 1 ep · 1951 - 2
The West WingSimon Donovan · 4 eps · 1999 - 3
From the Earth to the MoonWally Schirra · 1 ep · 1998 - 4
Charlie GraceCharlie Grace · 9 eps · 1995 - 5
Emergency!Ofcr. Dave Gordon · 1 ep · 1972 - 6
NCISSpecial Agent Leroy Jethro Gibbs · 2003–present · Drama - 7
CentennialCaptain John McIntosh · 12 eps · 1978 - 8
All's Fair1 ep · 1976 - 9
NCIS: OriginsOlder Leroy Jethro Gibbs (voice) (uncredited) · 16 eps · 2024 - 10
Boston PublicDirector · 2 eps · 2000 - 11
Reasonable DoubtsDet. Dicky Cobb · 44 eps · 1991 - 12
MoonlightingSam Crawford · 4 eps · 1985 - 13
Family GuyLeroy Jethro Gibbs (voice) · 1 ep · 1999 - 14
NCIS: New OrleansLeroy Jethro Gibbs · 4 eps · 2014 - 15
JAGLeroy Jethro Gibbs · 2 eps · 1995 - 16
Chicago HopeJack McNeil · 96 eps · 1994 - 17
Laverne & Shirley1 ep · 1976 - 18
The Hardy Boys / Nancy Drew Mysteries1 ep · 1977 - 19
Adam-12Officer Gus Corbin · 1 ep · 1968 - 20
SamMike Breen · 6 eps · 1978 - 21
And Never Let Her GoThomas Capano · 2 eps · 2001 - 22
The Legend of TarzanBob Markham (voice) · 1 ep · 2001 - 23
DelvecchioRonnie Striker · 1 ep · 1976 - 24
Goliath AwaitsPeter Cabot · 2 eps · 1981 - 25
Harts of the West1 ep · 1993 - 26
240-RobertThib Thibideaux · 13 eps · 1979 - 27Ozzie's Girls1 ep · 1973
- 28
Police WomanStanski · 1 ep · 1974 - 29
The Love BoatDoug Bradbury · 3 eps · 1977 - 30
Flamingo RoadField Carlyle · 37 eps · 1981 - 31
St. ElsewhereRobert Caldwell · 59 eps · 1982 - 32
The Dream MerchantsJohnny Edge · 3 eps · 1980 - 33
StrangersMark · 1 ep · 1996 - 34
The Deliberate StrangerTed Bundy · 2 eps · 1986
Top movies 30best Mark Harmon movies
- 1
Flamingo RoadFielding Carlyle · 1980 - 2
The First to GoJeremy Hampton · 1997 - 3
After the PromiseElmer Jackson · 1987 - 4
Little MoNorman Brinker · 1978 - 5
Justice League: Crisis on Two EarthsSuperman (voice) · 2010 - 6
Fear and Loathing in Las VegasMagazine Reporter · 1998 - 7
Dear America: Letters Home from Vietnam(voice) · 1987 - 8
Natural Born KillersMickey Knox in TV · 1994 - 9
Freakier FridayRyan · 2025 - 10
Wyatt EarpSheriff Johnny Behan · 1994 - 11
CasualtiesTommy Nance · 1997 - 12
And Never Let Her GoThomas Capano · 2001 - 13
Freaky FridayRyan · 2003 - 14
I'll Remember AprilJohn Cooper · 1999 - 15
The Last SupperDominant Male · 1995 - 16
Long Road HomeErtie Robertson · 1991 - 17
The Deliberate StrangerTed Bundy · 1986 - 18
Summer SchoolMr. Freddy Shoop · 1987 - 19
For All TimeCharles Lattimer · 2000 - 20
Local BoysJim Wesley · 2002 - 21
Crossfire TrailBruce Barkow · 2001 - 22
Stealing HomeBilly Wyatt · 1988 - 23
Chasing LibertyJames Foster · 2004 - 24
Let's Get HarryHarry · 1986 - 25
Comes a HorsemanBilly Joe Meynert · 1978 - 26
Shadow of a DoubtCharles Spencer · 1991 - 27
Getting MarriedHowie Lesser · 1978 - 28
The PresidioJay Austin · 1988 - 29
Weather GirlDale · 2009 - 30
DillingerJohn Dillinger · 1991