Mark Harmon

Thomas Mark Harmon is an American actor. He is most famous for playing the lead role of Leroy Jethro Gibbs in NCIS. He also has appeared in a wide variety of roles since the early 1970s. Initially a college football player, he was named "Sexiest Man Alive" by People magazine in 1986, due largely to his role as Dr. Robert Caldwell on St. Elsewhere, a role notable for being one of the first TV characters that had HIV. After spending the majority of the 1990s as a character actor, he played Secret Service special agent Simon Donovan in a four-episode story arc in The West Wing in 2002, receiving an Emmy Award nomination for the role. Harmon's character of NCIS special agent Leroy Jethro Gibbs was introduced in a guest starring role in two episodes of JAG. From 2003 to 2021, Harmon starred in the spinoff NCIS as the same character.

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Mark Harmon Removed From NCIS Opening Credits Nearly a Year After Exit

'NCIS': Mark Harmon Removed From Season 20 Opening Credits One Year After Exit

Mark Harmon Finally Removed from 'NCIS' Opening Credits, Exec Explains Why He Remained in Them After His Exit

Mark Harmon opens up about departing his role as Leroy Gibbs on NCIS: 'I thought it was honest'

Mark Harmon Addresses 'NCIS' Exit For The First Time

Mark Harmon Finally Speaks Out About Leaving ‘NCIS’: It Was An ‘Honest’ End For Gibbs

Mark Harmon Breaks His Silence on Leaving 'NCIS' After 19 Seasons

Mark Harmon Addresses 'NCIS' Exit After 19 Seasons for First Time (Exclusive)

Could Mark Harmon Return to NCIS? Executive Producer Says...

CBS Exec Explains Why Mark Harmon Is Still In 'NCIS' Opening Credits

‘NCIS’: Will The Hit CBS Series End After Mark Harmon’s Exit?

How Mark Harmon Will Still Be a Part of 'NCIS' After His Exit (Exclusive)

Mark Harmon exits CBS' long-running NCIS after more than 18 seasons

Mark Harmon: See Photos Of The ‘NCIS’ Star

Mark Harmon Exits 'NCIS' After 18 Seasons: How Gibbs Said His Goodbyes

Goodbye, Gibbs: Mark Harmon Exits ‘NCIS’ After 18 Seasons

Mark Harmon Exits NCIS After 18 Years

Mark Harmon Leaves NCIS. But How Did Gibbs Say Goodbye?

Mark Harmon Leaves 'NCIS' After 19 Seasons

Mark Harmon Exits 'NCIS' in Season 19