Don McGill is an American TV producer and writer who alongside Donald P. Bellisario wrote and produced episodes of JAG as well as some episodes of JAG's hugely successful spin-off series, "NCIS". McGill also aided in the production of TV shows such as CSI: Crime Scene Investigation and also NUMB3RS. Despite no longer having any part in the NCIS series, McGill remains credited as the show's co-creator alongside Bellisario.