Errol Mark Morris is an American film director known for documentaries that interrogate the epistemology of their subjects, and the invention of the Interrotron device for his style of filmmaking. In 2003, his documentary film The Fog of War: Eleven Lessons from the Life of Robert S. McNamara won the Academy Award for Best Documentary Feature. His film The Thin Blue Line placed fifth on a Sight & Sound poll of the greatest documentaries ever made. Morris is known for making films about unusual subjects; Fast, Cheap & Out of Control interweaves the stories of a wild animal trainer, a topiary gardener, a robot scientist and a naked mole rat specialist.

A documentary film or documentary is a non-fictional motion picture intended to "document reality, primarily for instruction, education or maintaining a historical record". Bill Nichols has characterized the documentary in terms of "a filmmaking practice, a cinematic tradition, and mode of audience reception [that remains] a practice without clear boundaries".