During the Holocaust Josef Mengele was the chief provider for the gas chambers at Auschwitz - and did well! Mengele did a number of medical experiments of unspeakable horror at Auschwitz, using twins. These twins as young as five years of age were usually murdered after the experiment was over and their bodies dissected. Despite international efforts to track him down, Josef Mengele was never apprehended and lived for 35 years hiding under various aliases. He lived in Paraguay and Brazil until his death in 1979.