(CNN) -- On Friday, August 4, 1944 -- a beautiful summer morning, not unlike the one on which I am writing this now -- a car pulled up in front of a spice warehouse at 263 Prinsengracht in Amsterdam. Inside the car were an Austrian Gestapo officer and his Dutch subordinates, who, acting on a tip-off (whose source has never been identified), had come to arrest the eight Jews who had been hiding for two years in an attic above the warehouse.
Before the war, Mengele had received doctorates in anthropology and medicine, and began a career as a researcher. He joined the Nazi Party in 1937 and the SS in 1938. He was assigned as a battalion medical officer at the start of World War II, then transferred to the Nazi concentration camps service in early 1943 and assigned to Auschwitz, where he saw the opportunity to conduct genetic research on human subjects. His subsequent experiments focused primarily on twins, with little regard for the health or safety of the victims.