Thomas Mark Harmon (born September 2, 1951) is an American actor.
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11 Actors Were Considered to Play Leroy Jethro Gibbs on 'NCIS' Before Mark Harmon (There Are 2 Oscar Winners On The List!)
Mark Harmon Got ‘Bored Real Fast’ With Retirement Post ‘NCIS’: He’s Looking for a ‘Fresh Start’
NCIS: Origins' Austin Stowell Got Feedback From Mark Harmon on the Spot
NCIS: Origins' Kyle Schmid Shares Mark Harmon's Advice for Playing Franks
Mark Harmon ‘Still Very Immersed’ in ‘NCIS’: He ‘Must Have a Say in Everything’
11 Famous Actors Were Considered to Play Gibbs on 'NCIS' Before Mark Harmon (There Are 2 Oscar Winners On The List!)
'NCIS: Origins' TV Show Gives Present-Day Gibbs Update, Reveals Where Mark Harmon's Character Is Now
Mark Harmon Reveals the Huge Compliment Paid to Austin Stowell After His 'NCIS: Origins' Audition!
Mark Harmon ‘There to Help’ Behind Camera as 'NCIS' Prequel Producer
Mark Harmon Explains Why His Son Sean Isn't Playing Young Gibbs in 'NCIS: Origins' Series
Mark Harmon on Returning to ‘NCIS: Origins’ After Choosing to Leave Franchise — and Why His Son Isn’t Portraying Young Gibbs in Prequel
Mark Harmon’s Pampering On ‘NCIS: Origins’ Set Has Got Costars on the New Show ‘In a Cranky Mood’
Mark Harmon Returns as Gibbs for 1st Time Since 2021 in ‘NCIS: Origins’
Mark Harmon to Make a Cameo on 'NCIS: Origins'!
Mark Harmon Talks Handing Over Gibbs Role to Austin Stowell & Why He's 'Pleased' to Take Step Back on 'NCIS: Origins'
Mark Harmon Says He’s “Fine” Stepping Back On ‘NCIS: Origins’: “I’m Just There To Support”
Mark Harmon Has No Idea Whether Gibbs Will Ever Appear on 'NCIS' Again
Mork & Mindy star Pam Dawber, 72, models a big hat during a rare sighting with her NCIS vet husband Mark Harmon at a vintage flea market in LA
Mark Harmon's 'NCIS' Character Almost Had a Completely Different Name
