Acting
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.
The Late Show with Stephen Colbert
2015 · TV
The Tonight Show Starring Johnny Carson
1962 · TV
NCIS
2003 · TV
Family Guy
1999 · TV
The Kelly Clarkson Show
2019 · TV
The Late Late Show with James Corden
2015 · TV
The West Wing
1999 · TV
Saturday Night Live
1975 · TV
The Love Boat
1977 · TV
Jimmy Kimmel Live!
2003 · TV
The View
1997 · TV
Chicago Hope
1994 · TV
JAG
1995 · TV
Golden Globe Awards
1944 · TV
The Tonight Show with Jay Leno
1992 · TV
NCIS: New Orleans
2014 · TV
Adam-12
1968 · TV
St. Elsewhere
1982 · TV
Emergency!
1972 · TV
The Bonnie Hunt Show
2008 · TV
Moonlighting
1985 · TV
NCIS: Origins
2024 · TV
Laverne & Shirley
1976 · TV
Police Woman
1974 · TV
Steve Harvey
2012 · TV
The Hardy Boys / Nancy Drew Mysteries
1977 · TV
Entertainment Tonight
1981 · TV
The Megan Mullally Show
2006 · TV
The Legend of Tarzan
2001 · TV
From the Earth to the Moon
1998 · TV
Freakier Friday
2025 · Movie
Fear and Loathing in Las Vegas
1998 · Movie
Freaky Friday
2003 · Movie
Reasonable Doubts
1991 · TV
Centennial
1978 · TV
The Arsenio Hall Show
2013 · TV
Natural Born Killers
1994 · Movie
Flamingo Road
1981 · TV
The Rosie O'Donnell Show
1996 · TV
Charlie Grace
1995 · TV
Harts of the West
1993 · TV
Strangers
1996 · TV
Wyatt Earp
1994 · Movie
All's Fair
1976 · TV
The American West
2016 · TV
Delvecchio
1976 · TV
240-Robert
1979 · TV
Hallmark Hall of Fame
1951 · TV
Goliath Awaits
1981 · TV
Summer School
1987 · Movie
Chasing Liberty
2004 · Movie
The Dream Merchants
1980 · TV
Justice League: Crisis on Two Earths
2010 · Movie
Crossfire Trail
2001 · Movie
Little Mo
1978 · Movie
The Presidio
1988 · Movie
Joe Montana: Cool Under Pressure
2022 · TV
The Last Supper
1995 · Movie
Beyond the Poseidon Adventure
1979 · Movie
The Deliberate Stranger
1986 · TV
Sam
1978 · TV
Cold Heaven
1992 · Movie
The Deliberate Stranger
1986 · Movie
Comes a Horseman
1978 · Movie
After the Promise
1987 · Movie
All or Nothing: The Michigan Wolverines
2018 · TV
NCISverse: The First 1,000
2024 · Movie
And Never Let Her Go
2001 · TV
Weather Girl
2009 · Movie
Stealing Home
1988 · Movie
Casualties
1997 · Movie
Local Boys
2002 · Movie
Magic in the Water
1995 · Movie
Dear America: Letters Home from Vietnam
1987 · Movie
And Never Let Her Go
2001 · Movie
Prince of Bel Air
1986 · Movie
Certain Prey
2011 · Movie
Sweet Bird of Youth
1989 · Movie
Let's Get Harry
1986 · Movie
Intimate Agony
1983 · Movie
Fourth Story
1991 · Movie
Tuareg: Desert Warrior
1984 · Movie
Dillinger
1991 · Movie
Till There Was You
1991 · Movie
The Amati Girls
2001 · Movie
For All Time
2000 · Movie
Shadow of a Doubt
1991 · Movie
I'll Remember April
1999 · Movie
Worth Winning
1989 · Movie
Long Road Home
1991 · Movie
Original Sins
1995 · Movie
Getting Married
1978 · Movie
The First to Go
1997 · Movie
Sonic Boom
1974 · Movie
Flamingo Road
1980 · Movie
The Wild
2019 · Movie
