Leroy Jethro Gibbs[4] (born November 21, 1954) [5] is a fictional character and the original protagonist of the CBS TV series NCIS, portrayed by Mark Harmon. [6] . He is a former U.S. Marine Corps Scout Sniper turned special agent who commands a team for the Naval Criminal Investigative Service.

Leroy Jethro Gibbs is a former NCIS Supervisory Special Agent (SSA) of the NCIS Major Case Response Team which operates out of the Navy Yard in Washington D.C. Prior to that he was a Gunnery Sergeant/Scout Sniper of the US Marine Corps.

Nov 8, 2024 · NCIS agent Jethro Gibbs (Mark Harmon) left the team in season 19; here's why, and what the actor's future looks like on the hit CBS show.

Aug 12, 2022 · Mark Harmon, who headed up NCIS for 18 years as Special Agent Gibbs, has addressed his exit from the show in October 2021

Thomas Mark Harmon (born September 2, 1951) is an American actor, writer, producer, television director and former football player. He is perhaps best known for playing the lead role of Leroy Jethro Gibbs on NCIS.

20 hours ago · NCIS: Origins is blessed with two leading men who demand attention. But which one is the true star of the show?

Jun 16, 2020 · NCIS wouldn't work without Leroy Jethro Gibbs. The improbably named special agent played by Mark Harmon is the linchpin of the show's entire expanded universe, the nexus around which its...

Dec 23, 2024 · Mark Harmon's Leroy Jethro Gibbs on NCIS is one of the most beloved characters of NCIS. While Harmon exited the show several times, those breaks were brief, and he was always back.

Feb 28, 2025 · Leroy Jethro Gibbs’ tragic past has been one of the most defining aspects of his character on NCIS. His wife, Shannon, and their daughter, Kelly, were murdered when Gibbs was still a Marine....

Mar 11, 2025 · Gibbs may no longer be a regular character on "NCIS" and its many spin-offs, but his list of rules lives on. They're all worth remembering, but don't worry if you've forgotten a rule or two...