Mark Harmon beat two Oscar winners to become NCIS’s Leroy Jethro Gibbs, turning the role into a TV legend over 19 seasons.

On NCIS, Murray plays Special Agent Timothy McGee ... Over 22 seasons, Murray says, he learned some invaluable lessons—including from Mark Harmon, who played the show’s lead, Leroy Jethro ...

Mark Harmon has grown to become a TV veteran ... 31 – and Pam isn't the first family member to appear on NCIS! Eldest son Sean has had a recurring role on the show playing a young version ...

Sean Harmon, Mark’s son and an executive producer of “Origins,” played Leroy Jethro Gibbs in a flashback episode of “NCIS.” “It will always be something I hold close to my heart,” he ...