Mark Harmon reveals how his friendship with retired NCIS agent Leon Carroll Jr. shaped his portrayal of Gibbs and led to ...

Mark Harmon played Leroy Jethro Gibbs for 19 seasons on 'NCIS.' The CBS franchise announced Mark will be a guest on the 'NCIS ...

Mark Harmon is returning to the NCISverse in a somewhat unexpected way. “Legends on legends on legends,” an Instagram post ...

Harmon was last seen onscreen as Gibbs on the prequel.

Origins" brought us the return of the older Gibbs -- and a new canine friend, which leads to one burning question.

Mark Harmon and retired NCIS special agent Leon Carroll Jr. wrote a new book, "Ghosts of Sicily." They spoke to Fox News ...

Former NCIS star Mark Harmon recently reflected on the beginnings of the show and his late friend and co-star David McCallum.

Mark Harmon played Leroy Jethro Gibbs for years on "NCIS," and now Austin Stowell has taken on the role for "NCIS: Origins." ...

I really wanted to see a young Gary Callahan, but we did that,” showrunner David J. North remarked while discussing the ...

NCIS star Mark Harmon has become a household name in the world of entertainment for his resonating performance in the ...

Although now synonymous with NCIS, Mark Harmon's path into acting wasn't exactly straightforward. During a recent appearance ...

Mark Harmon is shedding a little light on going from being the lead on NCIS to working more behind the scenes on NCIS: ...