• He portrayed doctors in two previous television series, Dr. Jack McNeil on Chicago Hope and Dr. Bobby Caldwell on St. Elsewhere. Harmon also had a limited engagement on the series Moonlighting. He played secret service agent Simon Donovan for Press Secretary CJ Cregg on The West Wing. He also played Morgan Fairchild's unfaithful husband on Flamingo Road. Since 2003, he has starred as Leroy Jethro Gibbs in CBS' drama television show NCIS.
• One of his more famous movie roles was as Mr. Freddy Shoop in Summer School. He has also portrayed serial killer Ted Bundy in the television movie The Deliberate Stranger (1986). Harmon was named People magazine's Sexiest Man Alive in 1986.

Has also been referenced as the world's greatest actor by Peter Griffin, of Family Guy Fame in the episode No Meals on Wheels ---WIKIPEDIA.org

• Mark Harmon is the cutest, hottest and best actor that ever lived. He has a really long brilliant career starring in a bunch of movies and tv series. He currently plays Special Agent Leroy Jethro Gibbs on NCIS, the best show on tv.