1) 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. Since 2003, Harmon has starred as Leroy Jethro Gibbs in the CBS series NCIS. 2) Bassist for The 77's and Strawmen. Also half of Michael Roe & Mark Harmon.
