Mark Harmon, American actor and producer
Thomas Mark Harmon (born September 2, 1951) is an American actor. He played the lead role of Leroy Jethro Gibbs in NCIS. He also has appeared in a wide variety of roles since the early 1970s. Initially a college football player, he was named "Sexiest Man Alive" by People magazine in 1986, due largely to his role as Dr. Robert Caldwell on St. Elsewhere. After spending the majority of the 1990s as a character actor, he played Secret Service special agent Simon Donovan in The West Wing, receiving a 2002 Emmy Award nomination for his acting in a four-episode story arc.Harmon's character of NCIS special agent Leroy Jethro Gibbs was introduced in a guest starring role in two episodes of JAG. From 2003 to 2021, Harmon starred in the spinoff NCIS as the same character.