Nazi Concentration Camps
The US Holocaust Memorial Museum website has a digitized version of the movie Nazi Concentration Camps found here.
The museum lists the director as being "Navy Cmdr. James B. Donovan" the first name listed of three directors:
Only hours after the liberation of the Mauthausen camp, Lt. Col. George C. Stevens, the famed Hollywood director, arrived to shoot some footage of Lt. Taylor for his film entitled “Nazi Concentration Camps,” which was shown at the Nuremberg IMT. JACK TAYLOR OSS – Concentration Camp Survivor