Pare Lorentz

As the most influential documentary filmmaker of the Great Depression, Lorentz was the leading American advocate for government-sponsored documentary films. His service as a filmmaker for the U.S. Army Air Corps during World War II was formidable, including technical films, documentation of bombing raids, and synthesizing raw footage of Nazi atrocities for an educational film on the Nuremberg Trials. Nonetheless, Lorentz perennially will be known best as "FDR′s filmmaker." Provided by Wikipedia