Mark Harmon …
Mark Harmon (born September 2, 1951) is an American television and film actor. He has appeared in a wide variety of roles since the early 1970s.
He gained recognition for portraying Secret Service special agent Simon Donovan in The West Wing, receiving a 2002 Emmy Award nomination for his acting in the four-episode story arc. A year later he was cast in a similar role as special agent Leroy Jethro Gibbs in the American police procedural series NCIS.
He has been married to actress Pam Dawber since 1987.