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 ...

Mark Harmon's son, portrayed a younger version of his father's "NCIS" character seven times in the main series, he did not ...

Mark Harmon's son, Sean Harmon ... serving as an executive producer for the series, along with his father, who narrates NCIS: ...

Before his iconic role, Mark was on the verge to becoming a quarterback for the NFL. This comes as a surprise to some but little did many know, his father, Tom Harmon, was a Heisman Trophy winner ...

When NCIS needed someone to portray a young Leroy Jethro Gibbs, the show’s team didn’t need to look far to find the right person. Sean Harmon – the son of Gibbs actor Mark Harmon – stepped ...