Mark Harmon’s portrayal of Leroy Jethro Gibbs in NCIS has cemented his legacy as one of television’s most iconic characters. From the show’s inception in 2003 until his departure in 2021, Harmon brought depth, grit, and quiet authority to the role of Gibbs, the leader of the Major Case Response Team at the Naval Criminal Investigative Service.
Gibbs’ complex personality, marked by his strict discipline, unyielding loyalty, and unshakable moral compass, became the series’ backbone.
Gibbs, a former Marine sniper turned NCIS Special Agent, led his team with a unique blend of toughness and compassion. He was both a skilled investigator and a mentor, guiding his team through the intricacies of their high-stakes missions. Gibbs’ ability to connect with people—both suspects and colleagues—made him not only a remarkable leader but also a compelling character.
appeared in 435 episodes of NCIS, including two crossover episodes with JAG, the series from which NCIS spun off. His presence was integral to the show’s success, with Gibbs at the center of the team’s most memorable cases and storylines.
In 2021, Harmon stepped away from NCIS during its 19th season. His departure was handled delicately, with Gibbs choosing to retire from law enforcement to seek peace in Alaska. Harmon later explained that the decision was driven by a desire to keep the character’s journey authentic and honest. “What has always drawn me here is the character I play and keeping it fresh,” Harmon said. “I thought it was honest and OK with.”
Though no longer an on-screen presence, Harmon remains deeply connected to NCIS. He serves as an executive producer and continues to shape the series behind the scenes.