Here's what you need to know about the man, the myth, the legend. Mark hails from the illustrious Harmon family. His mother, ...

PEOPLE: Mark, what do you remember about casting ... you can feel it. STOWELL: We're a family already. HARMON: And if you can ...

NCIS' Mark Harmon reportedly shares many similarities with his character in the series Leroy Jethro Gibbs, including his biggest hobby.

Mark Harmon expected NCIS to be dark and gritty — then it became a quippy crime procedural. Not what he signed up for, but it ...