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Born · September 2, 1951 (73 years old)
Known For: Acting
Place of Birth: Burbank, California, USA
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.
Ryan
0.0
2025
Older Leroy Jethro Gibbs (uncredited) · (1 episode)
7.9
2024
Older Leroy Jethro Gibbs (voice) (uncredited) · (1 episode)
7.9
2024
Self
9.0
2024
Narrator (voice) · (6 episodes)
6.5
2022
Self · (1 episode)
6.2
2019
Self
7.0
2019
Narrator (voice) · (8 episodes)
8.0
2018
Self · (8 episodes)
6.9
2016
Self · (1 episode)
5.4
2015
Leroy Jethro Gibbs · (4 episodes)
7.3
2014
Self · (1 episode)
5.7
2013
Lucas Davenport
4.8
2011
Clark Kent / Superman (voice)
7.3
2010
Dale
5.6
2009
(1 episode)
4.4
2008
Self - Guest · (1 episode)
4.2
2006
Self · (1 episode)
6.1
2004
James Foster
6.2
2004
Leroy Jethro Gibbs · (435 episodes)
7.6
2003
Ryan
6.5
2003
(1 episode)
5.5
2003
Jim Wesley
6.4
2002
Self
0.0
2002
Bob Markham (voice) · (1 episode)
6.8
2001
John Cooper
6.3
2001
Thomas Capano
6.6
2001
Thomas Capano · (2 episodes)
5.0
2001
Bruce Barkow
6.4
2001
Lawrence
2.5
2001
Charles Lattimer
6.3
2000
Simon Donovan · (4 episodes)
8.3
1999
Leroy Jethro Gibbs (voice) · (1 episode)
7.4
1999
Magazine Reporter
7.2
1998
Wally Schirra · (1 episode)
8.2
1998
Self · (1 episode)
4.4
1997
Tommy Nance
6.6
1997
Jeremy Hampton
0.0
1997
Self · (1 episode)
3.5
1996
Leroy Jethro Gibbs · (2 episodes)
7.3
1995
Charlie Grace · (9 episodes)
0.0
1995
Dominant Male
6.6
1995
Jack Black
5.4
1995
Johnathan Franye
7.0
1995
Jack McNeil · (96 episodes)
7.2
1994
Mickey Knox in TV
7.1
1994
Sheriff Johnny Behan
6.8
1994
(1 episode)
6.2
1993
Alex Davenport
4.5
1992
(1 episode)
5.4
1992
Det. Dicky Cobb · (44 episodes)
7.2
1991
Frank Flynn
3.3
1991
Charles Spencer
5.2
1991
Ertie Robertson
5.3
1991
David Shepard
5.6
1991
John Dillinger
4.5
1991
Taylor Worth
5.2
1989
Chance Wayne
5.8
1989
Billy Wyatt
6.3
1988
Jay Austin
5.9
1988
Elmer Jackson
7.7
1987
(voice)
7.1
1987
Mr. Freddy Shoop
6.4
1987
Harry
6.2
1986
Ted Bundy
6.5
1986
Robin Prince
5.1
1986
Sam Crawford · (4 episodes)
7.5
1985
Gacel Sayah
5.8
1984
Tommy
4.3
1983
Robert Caldwell · (70 episodes)
5.4
1982
Peter Cabot · (2 episodes)
6.8
1981
Self · (1 episode)
3.7
1981
(37 episodes)
6.0
1981
Fielding Carlyle
0.0
1980
Johnny Edge · (3 episodes)
4.5
1980
Thib Thibideaux · (13 episodes)
5.5
1979
Larry Simpson
5.0
1979
Billy Joe Meynert
6.0
1978
Captain John McIntosh · (12 episodes)
7.7
1978
Norman Brinker
7.5
1978
Howie Lesser
4.0
1978
Mike Breen · (6 episodes)
0.0
1978
Doug Bradbury · (3 episodes)
6.3
1977
Robert Dunlap
5.1
1977
(1 episode)
7.0
1977
(1 episode)
7.0
1976
Ronnie Striker · (1 episode)
0.0
1976
(2 episodes)
7.2
1976
Self - Host · (1 episode)
6.9
1975
(1 episode)
6.2
1974
Stanski · (1 episode)
6.2
1974
Student Controller
4.5
1974
(1 episode)
7.0
1973
(1 episode)
7.8
1972
Officer Gus Corbin · (1 episode)
7.1
1968
Self · (1 episode)
7.4
1962
Charles · (1 episode)
8.7
1951
Self - Nominee · (2 episodes)
6.8
1944
Self · (1 episode)
6.8
1944