Rudolf Vrba

Rudolf Vrba (born Walter Rosenberg; 11 September 1924 – 27 March 2006) was a Slovak-Jewish biochemist who, as a teenager in 1942, was deported to the Auschwitz concentration camp in German-occupied Poland. He escaped from the camp in April 1944, at the height of the Holocaust, and co-wrote the Vrba-Wetzler report, a detailed report about the mass murder taking place there. The report, distributed by George Mantello in Switzerland, is credited with having halted the mass deportation of Hungary's Jews to Auschwitz in July 1944, saving more than 200,000 lives. After the war, Vrba trained as a biochemist, working mostly in England and Canada.

Vrba and his fellow escapee Alfréd Wetzler fled Auschwitz three weeks after German forces invaded Hungary and shortly before the SS began mass deportations of Hungary's Jewish population to the camp. The information the men dictated to Jewish officials when they arrived in Slovakia on 24 April 1944, which included that new arrivals in Auschwitz were being gassed and not "resettled" as the Germans maintained, became known as the Vrba–Wetzler report. When the War Refugee Board published it with considerable delay in November 1944, the New York Herald Tribune described it as "the most shocking document ever issued by a United States government agency". While it confirmed material in earlier reports from Polish and other escapees, the historian Miroslav Kárný wrote that it was unique in its "unflinching detail".