Don Bellisario, a key figure in shaping the success of NCIS as its co-creator, wielded significant influence but was known for his challenging personality. Director James Whitmore initially hesitated to collaborate with him due to Bellisario’s volatile nature but eventually joined NCIS. Bellisario encountered difficulties not only with Whitmore but also with lead actor Mark Harmon, creating a challenging working environment.
By the fifth year, the network intervened, leading to Bellisario’s departure from the series. Bellisario addressed the reported feud, dismissing it as a PR campaign initiated by Harmon highlighting poor working conditions on set. Harmon, satisfied with the changes, emphasized the show’s enhanced organization and productivity following Bellisario’s exit.