Mark Harmon with that barbershop quartet haircut

Actor Mark Harmon appears at CBS Studios in New York City in this undated photo. Harmon wears his distinctive center-parted hairstyle, possibly a throwback to his days as a barbershop quartet tenor (if, indeed, he was ever in a barbershop quartet). Mark Harmon starred in hundreds of episodes of the CBS crime series NCIS from 2003 into the 2020s, so this photo could have been taken at any time in that period. Harmon played special agent Leroy Jethro Gibbs, a former Marine Corps sniper who became a big dog in the Naval Criminal Investigative Service.