Mark Harmon recently reflected on the lasting legacy of his longtime friend and NCIS co star David McCallum. What began as a professional partnership on the show grew into a deep friendship built on respect and shared experiences.
Harmon remembered McCallum as a mentor and trusted colleague who brought calm professionalism and wisdom to the set. Cast and crew admired his kindness, dedication, and collaborative spirit, which helped create a positive atmosphere during the show’s long run.
McCallum’s portrayal of Dr. Donald “Ducky” Mallard became one of NCIS’s most beloved roles. His warmth, intelligence, and depth made the character unforgettable and helped shape many of the show’s most memorable moments.
According to Harmon, McCallum’s influence continues to live on through the friendships, stories, and teamwork that defined the NCIS family.