Contrary to rumors of retirement, Harmon has clarified that he simply "pushed away" from the grueling 22-hour-day schedule of a series lead to focus on fresh challenges.
In November 2023, he released his first book, Ghosts of Honolulu: A Japanese Spy, a Japanese American Spy Hunter, and the Untold Story of Pearl Harbor , co-authored with former NCIS technical advisor Leon Carroll Jr..
Since his official departure from the long-running series in October 2021, Mark Harmon has transitioned into a new chapter of his career characterized by strategic production roles, literary ventures, and a selective return to the screen.
Harmon reprised his role as Ryan Coleman in the Disney sequel Freakier Friday (2025), reuniting with Jamie Lee Curtis and Lindsay Lohan.
He made a brief on-screen appearance in the NCIS: Origins pilot and returned for a special Veterans Day crossover event in November 2025. 🏠 Personal Life and Wealth Mark Harmon Net Worth
He continues to serve as an executive producer for the NCIS franchise and is the narrator for the prequel series, NCIS: Origins , which premiered in October 2024.