About Mark Harmon
Thomas Mark Harmon (born September 2, 1951) is an American actor, writer, producer, television director and former football player. He is best known for playing the lead role of Leroy Jethro Gibbs on NCIS. He has appeared in a wide variety of television roles since the early 1970s, including as Dr. Robert Caldwell on St. Elsewhere, Detective Dicky Cobb on Reasonable Doubts, and Dr. Jack McNeil on Chicago Hope. He also starred in such films as Summer School, Prince of Bel Air, Stealing Home, Wyatt Earp, Fear and Loathing in Las Vegas, Crossfire Trail, Local Boys, Freaky Friday, and Chasing Liberty. Harmon played Secret Service special agent Simon Donovan in a four-episode story arc in The West Wing in 2002, receiving an Emmy Award nomination for the role. 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. During his two years as quarterback in coach Pepper Rodgers' wishbone offense, UCLA compiled a 17–5 record (.773). During his first game, his UCLA team produced a stunning upset of the two-time defending national champion Nebraska Cornhuskers. The Bruins were an eighteen-point home underdog to the top-ranked Huskers but won 20–17 on a late field goal by Efren Herrera at L.A.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.