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Mark Harmon

Thomas Mark Harmon is an American actor, writer, producer, television director, and former football player born in Burbank, California, U.S. He is perhaps best known for playing the lead role of Leroy Jethro Gibbs on NCIS. He has appeared in a wide variety of television roles since the early 1970s, including Dr. Robert Caldwell on St. Elsewhere, Detective Dicky Cobb on Reasonable Doubts, and Dr. Jack McNeil on Chicago Hope. He also starred in such films as Summer School, Prince of Bel Air, Stealing Home, Wyatt Earp, Fear and Loathing in Las Vegas, Freaky Friday, and Chasing Liberty.

Known For

Credits

Cast Credits

NCIS: Origins (2024)
Guest starring as Leroy Jethro Gibbs (18 episodes)
Live with Kelly & Mark (2023)
Guest starring as Mark Harmon
CBS Mornings (2021)
Guest starring as Mark Harmon (2 episodes)
The Kelly Clarkson Show (2019)
Guest starring as Mark Harmon
All or Nothing: The Michigan Wolverines (2018)
Starring as Narrator (8 episodes)
The Late Show with Stephen Colbert (2015)
Guest starring as Mark Harmon
The Late Late Show with James Corden (2015)
Guest starring as Mark Harmon
NCIS: New Orleans (2014)
Guest starring as Special Agent Leroy Jethro Gibbs (4 episodes)
The Arsenio Hall Show (2013)
Guest starring as Mark Harmon
Larry King Now (2012)
Guest starring as Mark Harmon
The Talk (2010)
Guest starring as Mark Harmon (2 episodes)
NCIS (2003)
Starring as Special Agent Leroy Jethro Gibbs (418 episodes)
The Legend of Tarzan (2001)
Guest starring as Bob Markham
The West Wing (1999)
Guest starring as Agent Simon Donovan (4 episodes)
From the Earth to the Moon (1998)
Guest starring as Walter Schirra
The View (1997)
Guest starring as Mark Harmon
The Daily Show with Craig Kilborn (1996)
Guest starring as Mark Harmon
JAG (1995)
Guest starring as Leroy Jethro Gibbs (2 episodes)
Charlie Grace (1995)
Starring as Charlie Grace
Chicago Hope (1994)
Starring as Dr. Jack McNeil (95 episodes)
Harts of the West (1993)
Guest starring as Rodeo clown
Reasonable Doubts (1991)
Starring as Det. Dicky Cobb (44 episodes)
The Deliberate Stranger (1986)
Starring as Ted Bundy
Moonlighting (1985)
Guest starring as Sam Crawford (4 episodes)
St. Elsewhere (1982)
Starring as Dr. Robert Caldwell (63 episodes)
Goliath Awaits (1981)
Starring as Peter Cabot (2 episodes)
  • Episode 1x02: Part 2 (Nov 17, 1981)
  • Episode 1x01: Part 1 (Nov 16, 1981)
Flamingo Road (1981)
Starring as Fielding Carlyle (37 episodes)
240-Robert (1979)
Starring as Deputy Dwayne 'Thib' Thibideaux (13 episodes)
James A. Michener's Centennial (1978)
Guest starring as Captain John McIntosh (3 episodes)
The Hardy Boys/Nancy Drew Mysteries (1977)
Guest starring as Chip Garvey
Battle of the Network Stars (1976)
Guest starring as Mark Harmon (3 episodes)
Guest starring as NBC Captain
Delvecchio (1976)
Guest starring as Ronnie Striker
Laverne & Shirley (1976)
Guest starring as Victor
Saturday Night Live (1975)
Guest starring as Mark Harmon
Police Woman (1974)
Guest starring as Paul Donin
Guest starring as Stanski
Police Story (1973)
Guest starring as Officer Hazelton
Emergency! (1972)
Guest starring as Ofcr. Dave Gordon
Adam-12 (1968)
Guest starring as Officer Gus Corbin
The Tonight Show Starring Johnny Carson (1962)
Guest starring as Mark Harmon

Crew Credits

NCIS: Origins (2024)
Show crew as Executive Producer (3 episodes)
NCIS: New Orleans (2014)
Show crew as Executive Producer (132 episodes)
NCIS (2003)
Show crew as Executive Producer (187 episodes)
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