Mark Harmon (born September 2, 1951 in Burbank, California), is an American actor. Harmon is currently the star of the CBS series NCIS.
He is the son of College Football All-American University of Michigan football legend and Heisman Trophy winner Tom Harmon, and of well-known actress, Elyse Knox. He has two sisters: Kristin Nelson, a renown American primitive artist, and former actress Kelly Harmon.
Harmon attended UCLA and, following in his father's athletic footsteps, was the starting quarterback for the UCLA Bruins in 1972 and 1973. He was also awarded the National Football Foundation Award for All-Round Excellence in 1973.
Harmon is married to actress Pam Dawber, with whom he has two sons: Sean Thomas Harmon (born April 26, 1988) and Tyrone Christian Harmon (born June 25, 1992).
He portrayed doctors in two previous series, Dr. Jack McNeil on Chicago Hope and Dr. Bobby Caldwell on St. Elsewhere. One of his more famous movie roles was as Mr. Freddy Shoop in Summer School.