Leroy Jethro Gibbs is a fictional character and the original protagonist of the CBS TV series NCIS, portrayed by Mark Harmon. He is a former U.S. Marine Corps Scout Sniper turned special agent who commands a team for the Naval Criminal Investigative Service. Gibbs is the most accomplished marksman on the team and the most skilled at handling violent standoffs; he depends on his other agents heavily for technical forensics and background checks. He is patient but firm with his team and has little patience for bureaucracy; he commands most other main characters—including his current staff Timothy McGee and Nick Torres and previous staff Caitlin Todd (killed in the line of duty), Anthony DiNozzo (left to look after his newly found daughter), Ziva David (presumed as killed after leaving NCIS; later revealed to have gone into hiding), Alexandra Quinn (left to look after her sick mother), Clayton Reeves (killed while defending Abby Sciuto), Ellie Bishop (left presumably for a mission with Odette) and Jacqueline Sloane (left to pursue humanitarian work in Afghanistan). Gibbs was born on November 21, 1954, as confirmed in the episode "Date with Destiny", in which he visits his wife Shannon's and his daughter Kelly's grave and the date is shown on the headstone. On June 21, 2021, it was reported that Harmon would only appear in a limited capacity during season 19. Having found peace in Alaska for the first time since his family's death, Gibbs leaves NCIS in the episode "Great Wide Open" in search of adventure. Development and casting Series creator Donald P. Bellisario initially did not think Mark Harmon would fit the role of Gibbs, a "flinty type with a strong sense of honor and respect for the military", but changed his mind after viewing a tape of Harmon's portrayal of a Secret Service agent on The West Wing. Co-executive producer Charles Floyd Johnson recalls, "We all looked at that work. And everybody said, 'He's Gibbs.' Harmon was cast in 2003, and Bellisario explained, "I said, 'Oh, my God, he's Gibbs.' He had matured. He's good-looking in a totally different way than he was as a young guy." At another point, he said, "I am so lucky to have Mark Harmon as the lead. You have no idea. This cast is gold. Mark Harmon is a Middle American guy, even if he was raised in Southern California. His values are exactly the same