Mark Harmon built a solid and enduring television legacy through steady talent and understated charisma. Born on September 2, 1951, in Burbank, California, he initially pursued sports, playing quarterback at UCLA, before turning to acting. He gained attention in the 1980s with roles in shows like St. Elsewhere and films such as Summer School (1987). Harmon’s good looks and calm demeanor made him a frequent leading man in TV movies and crime dramas. Yet it was his role as Leroy Jethro Gibbs on NC

A Guide to the Stars of “NCIS”