Dr. Piper is credited as one of the historians who helped establish a more accurate number of victims of Auschwitz-Birkenau death camps.
[2] Franciszek Piper, former Head of Historical department of the Auschwitz Museum, is the author of scholarly analysis translated numerous times and widely quoted by foremost Holocaust historians and the media,[3] in which he presented the results of his scientific analysis of the original sources and findings on the deportations to Auschwitz.
About 81 percent of Jews transported to Auschwitz by the Holocaust trains, or 890,000 men, women, and children, were murdered immediately upon arrival and were not registered.
The postwar testimony of camp's commandant, Rudolf Höss, presented at the Nuremberg trials of 1946, was therefore also proven to be unreliable and grossly exaggerated for reasons unknown.
The book by Franciszek Piper was published in English as Auschwitz: How Many Perished Jews, Poles, Gypsies, consecutively in 1991, 1992 and 1994.