What Mark Harmon is doing now after NCIS has been a subject of discussion among his fans. Read on to discover his new projects since leaving NCIS.

Mark Harmon continues his collaboration with former special agent Leon Carroll Jr. in their groundbreaking NCIS book series!

Mark Harmon may have left NCIS, but he'll forever be synonymous with Supervisory Special Agent Leroy Jethro Gibbs. "Mark's always been part of the show, Mark's always going to be part of the show," ...

We're moments away from having Mark Harmon back on our TV screens—and we finally have a sneak peek of what he's up to. "Mark Harmon is back as Gibbs on #NCISOrigins!" the caption read alongside the ...

(CBS) - Mark Harmon will make a special guest appearance as Leroy Jethro Gibbs on NCIS: Origins on Nov. 11. Harmon played Gibbs for 18 seasons on NCIS. In the crossover event airing on Veterans Day, ...

The upcoming NCIS and NCIS: Origins crossover brings Mark Harmon back onscreen as Leroy Jethro Gibbs, though his presence remains a constant part of the prequel. He serves as an executive producer and ...

"NCIS" legend Mark Harmon is bringing his OG Leroy Jethro Gibbs character to the prequel series "NCIS: Origins," and he's not coming alone. Harmon, 74, will make a rare guest appearance on "Origins" ...

Bestselling Authors Mark Harmon and Leon Carroll, Jr. Return to Release Third Installment, Ghosts of Sicily, from Harper Select on April 14, 2026 From the New York Times bestselling authors and NCIS ...