Chosen as People Magazine's Sexiest Man Alive. [1986]
Did over 20 Coors beer commercials in the 80s.
Father, Tom Harmon, played for the University of Michigan Wolverines and won the 1940 Heisman Trophy emblematic of the best player in the nation.
Graduated cum laude from UCLA, 1974, with degree in communications. Also played quarterback for UCLA Bruins, 1972-73 winning National Football Foundation Award for all-round excellence.
Had two famous brothers-in-law: car magnate John DeLorean and Rock and Roll Hall of Fame inductee Ricky Nelson.
Harmon and Pam Dawber have two children: Sean Harmon (born on 25 April 1988) and Ty Harmon (born on 25 June 1992).
His first acting gig was playing a gorilla on "Ozzie's Girls" (1973).
His godfather Forest Evashevski is in the National Football Foundation Hall of Fame.
His oldest son, Sean Harmon, plays a young Gibbs on "NCIS" (2003).
In his first game, Mark led the Bruins to a 20 - 17 underdog win over Nebraska, snapping the two-time defending national champion's 32 game winning streak.
Mark has an abducted left knee from his football career.
Mark has been known to wear shirts which have been sent to him by his fans.
Mark has broken his shoulder twice. Once during the filming of the movie, Summer School (1987), and while filming a Coors commercial.
Mark received a call from the producers during the summer between seasons 3 and 4 of "NCIS" (2003) telling him to stop shaving, because his character Jethro Gibbs was to have a more gruff look, along with a mustache.
Mark studied sign language for his various television roles with The Sign Company.
No relation to Angie Harmon, although both have starred in a series also starring Sasha Alexander..
Not the grandson of former U.S. Secretary of the Navy William Franklinn (Frank) Knox; his mother, former actress Elyse Knox--born Elsie Lillian Kornbrath to Frederick and Elizabeth Kornbrath in Hartford, Connecticut--was not Knox's daughter, despite several sources that say she was.
QB of the 1972-1973 UCLA Bruins. Teammate of Randy Gaschler.
Risked his life to save two teenage boys who were involved in a car accident outside of his home. Harmon used a sledge hammer from his garage to break the window out of their car then pulled them free so they wouldn't be burned to death, while his wife Pam Dawber called 911. He made every effort to downplay his role in saving their lives. [1996].
Studied pre-med in college before transferring to communications. He later played doctors on "St. Elsewhere" (1982) and "Chicago Hope" (1994).