| First Name | Mark |
| Last Name | Harmon |
| Full Name at Birth | Thomas Mark Harmon |
| Age | 60 |
| Date of Birth | September 2, 1951 |
| Birthplace | Burbank, California |
| Height | 6' (183 cm) |
| Build | Average |
| Hair Color | Salt and Pepper |
| Star Sign | Virgo |
| Religion | Roman Catholic |
| Ethnicity | White |
| Nationality | American |
| University | BA Communications, UCLA, California (1974) |
| Occupation Category | Actor |
| Claim to Fame | The Presidio, NCIS |
| Father | Tom Harmon |
| Mother | Elyse Knox |
| Sister(s) | Kristin NelsonKelly Harmon |
Mark Harmon (born September 2, 1951) is an American actor who has been starring in U.S. television programs and films since the mid-1970s, after a career as a collegiate football player with the UCLA Bruins. Since 2003, Harmon has starred as Leroy Jethro Gibbs in the CBS series NCIS.
Selected Mark Harmon film and TV show credits: