Errol Morris is a documentary filmmaker famous for his investigatory films.
Check out an engaging interview with Morris here.
Gates of Heaven (1978)
Vernon, Florida (1981)
The Thin Blue Line (1988)
The Dark Wind (1991)
A Brief History of Time (1991)
Fast, Cheap and Out of Control (1997)
Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr. (1999)
First Person (2000)
The Fog of War: Eleven Lessons from the Life of Robert S. McNamara (2003)
Standard Operating Procedure (2008)