Actor Mark Harmon, best known for his role on the hit TV show NCIS, turns 72 on September 2, 2023. As we celebrate his birthday, let's take a trip down memory lane with some memorable photos of the handsome actor through the years. From sporting scruff at the 1981 Eddie Awards to being crowned People's Sexiest Man Alive in 1986, Harmon has always been a heartthrob. He has had a successful career in television and film, including groundbreaking roles like his portrayal of a character who contracted and died of AIDS on the medical drama St. Elsewhere. Harmon has also maintained a discreet personal life, being married to actress Pam Dawber for over 35 years and raising their two sons together.