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.
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.. He continues to serve as an executive producer
Harmon reprised his role as Ryan Coleman in the Disney sequel Freakier Friday (2025), reuniting with Jamie Lee Curtis and Lindsay Lohan. he released his first book
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 Ghosts of Honolulu: A Japanese Spy