At HBO, Mark Cerulli was an award-winning writer/producer working on movie promos and featurettes and interviewing dozens of major stars and filmmakers. He worked on a number of DVD documentaries including the Halloween series for Anchor Bay and two James Bond classics for MGM. He also wrote episodes of Hey Dude for Nickelodeon. Most recently, Mark directed and produced By Design: The Joe Caroff Story, a documentary feature that premiered on Turner Classic Movies in October 2022 and is now streaming on HBOMax.