Mark Harmon Age: Thomas Mark Harmon is an American actor, producer, director, voice actor, and professional football player who is best known for his role as Thomas Mark Harmon. He is most recognised for his portrayal of Leroy Jethro Gibbs, the main character on the television series NCIS.
Since the early 1970s, he has also appeared in a wide range of roles in both film and television. Originally a collegiate football player, his portrayal on St. Elsewhere earned him the title of “Sexiest Man Alive” in 1986, according to People magazine.
Having spent the bulk of the 1990s working as a character actor, he landed the role of Secret Service special agent Simon Donovan on The West Wing, earning him a nomination for an Emmy Award in 2002 for his performance in a four-episode storey arc.
Harmon’s character of NCIS special agent Leroy Jethro Gibbs made his television debut in two episodes of JAG, where he appeared as a guest star. For a decade, Harmon played the same character in the NCIS spinoff, which ran from 2003 until 2021.
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After graduating from Harvard-Westlake School, Harmon went on to earn an associate’s degree at Pierce College in Los Angeles, which took him two years to finish. After his second season at Pierce, in 1971, Harmon received offers from major college football programmes, ultimately choosing UCLA over Oklahoma, despite the fact that the Sooners had finished second in the nation the previous season and the Bruins had stumbled to a 2–7–1 record, finishing last in the Pac-8.
His first two seasons as a starter for the UCLA Bruins came in 1972 and 1973, after transferring from the University of California, Berkeley.
After losing to the two-time defending national champion Nebraska Cornhuskers in his first game, his UCLA team managed to pull off a surprising upset against the Cornhuskers. The Bruins were an eighteen-point underdog at home against the top-ranked Huskers, but they came away with a 20–17 victory thanks to a late field goal by Efren Herrera in front of a sellout crowd at the Los Angeles Coliseum.
Harmon was honoured with the National Football Foundation Award for All-Round Excellence during his final year of high school. During his two years as a quarterback in coach Pepper Rodgers’ wishbone offence, UCLA posted a 17–5 record under his leadership (.773). Harmon earned a B.A. in Communications from UCLA in 1974, receiving honours for his efforts. 
In 2010, he was inducted into the Pierce College Athletic Hall of Fame, which was the first class to do so.