Gibbs is a skilled organizer, disciplined and demanding. To outsiders, he can seem standoffish, especially to those who put pressure onto his team. He’s a no-nonsense agent and he displays a certain urgency to any investigation he pursues; especially if he’s given technical information about a complex subject matter. “Give it to me in English” is his typical response to these situations, forcing the expert (usually Abby or McGee) to get right to the point. He can be sarcastic, especially to his team or ex-wives. His typical sarcastic answer is “Ya think?”.

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He is known for communicating displeasure with a single look or the “silent treatment”. One of his interrogating techniques is to sit and glare at the suspect for twenty minutes or until the suspect buckles under pressure. Gibbs’ “steely gaze can cool a room by five degrees”. He has been referred to as one of the best interrogators in law enforcement and has occasionally been requested by external agencies to conduct interrogations.

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Gibbs has little patience for the “politics” and bureaucracy his job entails, usually leaving that aspect to his director, and prefers to be out in the field working with his agents. One of Gibbs’ most noted traits is his gut instinct. Tony explained to Ziva that “the Boss moves in mysterious ways” when she challenged Gibbs’ judgement—Gibbs was right. He has no patience with high-tech hardware, once seen as he stomped a Roomba to pieces before it could vacuum up evidence at his crime scene. On rare occasions, if the usual judicial process is incapable of brining a suspect to justice, he will turn a blind eye and allow “street justice” to run its course.

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His hobby is woodworking. Gibbs is shown to have a wooden-hulled sailboat under construction in his basement, which he builds entirely by hand without power tools. Gibbs has also been shown making wooden toys around Christmas time, repairing doors and furniture, fixing the roof on Mike Franks’ beach house, and offering to build Franks a teak hot tub. He also built Mike Franks’ coffin.

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One of Gibbs’ “trademarks” is that he will often slap the members of his team on the back of the head when displeased with their performance or, if they get sidetracked on another topic, to get them focused back on the case. Another of Gibbs’ quirks is his tendency to stop the building’s elevator between floors if he needs to have a short, urgent, private conversation with someone. He does this most often with his agents, and occasionally with his superiors or other law enforcement personnel.

 

Gibbs also speaks fluent Russian and signs with American Sign Language, most particularly with Abby.

Taken from Wikipedia.org.

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Gibbs was born in Stillwater, Pennsylvania. He is named after his fathers close friend and partner in the store, Leroy Jethro “LJ” Moor, after they worked together in the coal mines. LJ was a World War II veteran and Montford Point Marine, and he had influenced Gibbs to join the Marines. Gibbs left Stillwater in 1976 at age 18 to join the Marine Corps and did not return for over thirty years. Teenage Gibbs often provoked violence with defiance to his father, who constantly comes to his unwanted aid with a Winchester rifle or shotgun. He was also known around the area as a delinquent.

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He met his first wife Shannon, who worked at the local department store, when both were teenagers. Gibbs mother, Ann, is a redhead, a lot like Gibbs’ wives. While she was dying of cancer, she committed suicide by overdose so her family would not have to watch her suffer. Gibbs enlisted in the Marine Corps in 1976 and was a military police non-commissioned officer at Camp Lejeune before becoming a Scout Sniper. He served on tours of duty in Panama (Operation Just Cause) and with the 1st Battalion 1st Marines in the Persian Gulf (Operation Desert Storm). He was also deployed to Colombia on a classified mission.

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Not long after returning from the Gulf, he retired from the Marine Corps with the rank of Gunnery Sergeant and join the Naval Investigative Service (the former NCIS—then called NIS), in August 1991. As a junior agent, Gibbs was mentored by Mike Franks and the two became close friends; Franks continued calling him “Probie” even after retirement. After Franks retired, Gibbs rose to become head of his own Major Case Response Team. Before the time in which NCIS is set, Gibbs was described to have traveled extensively on operations, particularly in Eastern Europe.

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Gibbs is a highly skilled marksman with both his agency-issued SIG Sauer P228 and a sniper rifle. His knowledge of the Marine Corps and training as a sniper often comes into use—in one instance, he uses his wilderness tracking skills and marksmanship to either aid the investigation and get the team out of trouble. Gibbs is a private man of few words who discloses little to nothing about his personal life. He avoids discussing his life or past before he joined NCIS, especially to agents and co-workers under him, which leads to his team members constantly speculating over his private life. Aside from his tendency to use military slang, he rarely mentions or speaks at length about his time in the Marine Corps although he is often referred to as “Gunny” by other Navy and Marine officers. He occasionally dons a “USMC” hoodie or T-shirt when off duty and has a replica of the iconic Raising the Flag on Iwo Jima photograph framed and mounted about his fireplace in his home.

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Gibbs holds service personnel in the armed forces in high esteem and to a higher standard. He becomes particularly indignant when the guilty party is someone in position of trust and authority and has reacted violently on several occasions when apprehending corrupt high-ranking officers who committed crimes for monetary gain.

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taken from wikipedia.org