He is the Senior Curator of the Treblinka extermination camp museum in Treblinka with certification from the Ministry of Culture.
Prior to their shipping to Treblinka, Chana asked Calek on several occasions to obtain a false Kennkarte for her, identifying her as an ethnic Pole (Chana did not have the typical Jewish looks and Calel wrote that she could easily pass for a Pole if she dyed her hair).
Hingst served at Treblinka from the very first period of the mass killing operations under SS-Obersturmführer Irmfried Eberl from Austria.
Lance Morrow wrote in Time that Irving's picture of the "Führer as a somewhat harried business executive too preoccupied to know exactly what was happening in his branch offices at Auschwitz and Treblinka" was hard to accept.
Treblinka: Extermination Camp or Transit Camp? (Holocaust Handbook Series)Hastings, Castle Hill Publishers.
Samuel Moyn, A Holocaust Controversy: The Treblinka Affair in Postwar France, Brandeis University Press, 2005
Part 3 - Warsaw Ghetto, Gestapo headquarters, Pawiak Prison, Palmiry massacre site, Oskar Schindler's Deutsche Emalia Fabrika, Kraków-Płaszów concentration camp, Auschwitz-Birkenau, Treblinka, Fermont, Immerhof and Hackenberg on the Maginot Line, Compiègne, tomb of Napoleon and the German submarine pens and Cross-Channel guns in Normandy and the Pas-de-Calais.