Sean Harmon, son of Mark Harmon, came up with the concept for NCIS: Origins while playing young Gibbs. Now, the prequel series will dive into the early days of the iconic agent in the Naval Criminal ...

Mark Harmon has come a very long way from his very first acting jobs. The former NCIS star has been in the business since the early 1970s, and aside from his role as Special Agent Leroy Jethro ...

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