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.
Filmography · 96
NCIS
2003 · Leroy Jethro Gibbs
Family Guy
1999 · Leroy Jethro Gibbs (vo...
The Late Show with Stephen Colbert
2015 · Self - Guest
The Tonight Show Starring Johnny Carson
1962 · Self
The Kelly Clarkson Show
2019 · Self
The West Wing
1999 · Simon Donovan
JAG
1995 · Leroy Jethro Gibbs
The Love Boat
1977 · Doug Bradbury
Saturday Night Live
1975 · Self - Host
The Late Late Show with James Corden
2015 · Self
Chicago Hope
1994 · Jack McNeil
The View
1997 · Self
Jimmy Kimmel Live!
2003 · Self
NCIS: New Orleans
2014 · Leroy Jethro Gibbs
Golden Globe Awards
1944 · Self - Nominee
Adam-12
1968 · Officer Gus Corbin
Emergency!
1972 · Ofcr. Dave Gordon
The Tonight Show with Jay Leno
1992
St. Elsewhere
1982 · Robert Caldwell
NCIS: Origins
2024 · Older Leroy Jethro Gib...
Moonlighting
1985 · Sam Crawford
Laverne & Shirley
1976
Police Woman
1974 · Stanski
The Bonnie Hunt Show
2008 · Self
Steve Harvey
2012 · Self
The Megan Mullally Show
2006 · Self - Guest
The Hardy Boys / Nancy Drew Mysteries
1977
The Legend of Tarzan
2001 · Bob Markham (voice)
From the Earth to the Moon
1998 · Wally Schirra
Freakier Friday
2025 · Ryan
Freaky Friday
2003 · Ryan
Entertainment Tonight
1981 · Self
Centennial
1978 · Captain John McIntosh
Natural Born Killers
1994 · Mickey Knox in TV
Fear and Loathing in Las Vegas
1998 · Magazine Reporter
Reasonable Doubts
1991 · Det. Dicky Cobb
Flamingo Road
1981 · Field Carlyle
The Arsenio Hall Show
2013 · Self
Wyatt Earp
1994 · Sheriff Johnny Behan
Strangers
1996 · Mark
Charlie Grace
1995 · Charlie Grace
The Rosie O'Donnell Show
1996 · Self
Delvecchio
1976 · Ronnie Striker
Summer School
1987 · Freddy Shoop
240-Robert
1979 · Thib Thibideaux
The American West
2016 · Self
Goliath Awaits
1981 · Peter Cabot
All's Fair
1976
Justice League: Crisis on Two Earths
2010 · Superman (voice)
Harts of the West
1993
Hallmark Hall of Fame
1951 · Charles
Chasing Liberty
2004 · James Foster
Beyond the Poseidon Adventure
1979 · Larry Simpson
Cold Heaven
1992 · Alex Davenport
Crossfire Trail
2001 · Bruce Barkow
The Dream Merchants
1980 · Johnny Edge
Joe Montana: Cool Under Pressure
2022 · Self - Narrator (voice...
The Presidio
1988 · Jay Austin
The Deliberate Stranger
1986 · Ted Bundy
Local Boys
2002 · Jim Wesley
The Last Supper
1995 · Dominant Male
After the Promise
1987 · Elmer Jackson
The Deliberate Stranger
1986 · Ted Bundy
Comes a Horseman
1978 · Billy Joe Meynert
Weather Girl
2009 · Dale
Tuareg: Desert Warrior
1984 · Gacel Sayah
Stealing Home
1988 · Billy Wyatt
And Never Let Her Go
2001 · Thomas Capano
Magic in the Water
1995 · Jack Black
NCISverse: The First 1,000
2024 · Self
Little Mo
1978 · Norman Brinker
And Never Let Her Go
2001 · Thomas Capano
Sam
1978 · Mike Breen
Prince of Bel Air
1986 · Robin Prince
Certain Prey
2011 · Lucas Davenport
Dear America: Letters Home from Vietnam
1987 · (voice)
All or Nothing: The Michigan Wolverines
2018 · Narrator (voice)
For All Time
2000 · Charles Lattimer
Let's Get Harry
1986 · Harry
Casualties
1997 · Tommy Nance
The Amati Girls
2001 · Lawrence
Dillinger
1991 · John Dillinger
Intimate Agony
1983 · Tommy
Sweet Bird of Youth
1989 · Chance Wayne
Till There Was You
1991 · Frank Flynn
Worth Winning
1989 · Taylor Worth
I'll Remember April
1999 · John Cooper
Getting Married
1978 · Howie Lesser
The First to Go
1997 · Jeremy Hampton
Fourth Story
1991 · David Shepard
Sonic Boom
1974 · Student Controller
Flamingo Road
1980 · Fielding Carlyle
Long Road Home
1991 · Ertie Robertson
Original Sins
1995 · Johnathan Franye
Shadow of a Doubt
1991 · Charles Spencer
The Wild
2019 · Self