Mark Harmon

Mark Harmon, born Thomas Mark Harmon on September 2, 1951, is an American actor known for his role as Leroy Jethro Gibbs on the television series NCIS. With a career spanning several decades, Harmon has appeared in numerous television and film roles. Some of his notable television credits include Dr. Robert Caldwell on St. Elsewhere, Detective Dicky Cobb on Reasonable Doubts, and Dr. Jack McNeil on Chicago Hope. He has also appeared in films like Summer School, Prince of Bel Air, Stealing Home, Wyatt Earp, Fear and Loathing in Las Vegas, Freaky Friday, and Chasing Liberty. In 2002, Harmon received an Emmy Award nomination for his role as Secret Service special agent Simon Donovan in The West Wing. Born in Burbank, California, Harmon is the youngest of three children.