Mr. Death: The Rise & Fall of Fred A. Leuchter

Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr. is a 1999 documentary film by Errol Morris about execution technician Fred A. Leuchter, an engineer who became an expert on execution devices and was later hired by revisionist historian Ernst Zundel to "prove" that there were no gas chambers at Auschwitz. Leuchter published a controversial report confirming Zundel's position, which ultimately ruined his own career.