Members of the NCIS cast have finally spoken out about what it’s really like to work with Mark Harmon—and they’ve confirmed what fans have believed for years: he’s the true heart of the show. Best known for playing Leroy Jethro Gibbs, Harmon’s impact goes far beyond the screen.
Co-stars describe him as a true professional who creates a supportive and collaborative atmosphere on set. “Mark leads by example,” one cast member shared. “His humility and work ethic set the tone for everyone.”
Although Harmon stepped back from his leading role in NCIS during Season 19, his influence is still deeply felt. Many cast and crew members say he helped build a family-like environment that has kept the show strong for over 20 years—proving that his leadership off-screen is just as powerful as his presence on it.
