Among the survivors of Auschwitz-Birkenau was Philip Riteman, a Polish Jew sent to the camp in 1941, who had the presence of mind to lie about his age in order to be selected for the line that was destined for slave labor. In a speech which Riteman gave to Riverview and Central Collegiate students in Moose Jaw, Canada in May 2008, as reported by Lacey Sheppy in the Moose Jaw Times Herald on May 23, 2008, Riteman said that he grew up in Szereszow, Poland, a town of about 25,000 people - not unlike Moose Jaw. He was in Grade 5 when the war began in 1939. The Ritemans were rounded up and sent to the Pruzhany ghetto, where they lived for nine months in a 10-foot by 12-foot room with two other families.
In October 1941, Himmler authorized SS General Odilo Globocnik (SS and police leader for the Lublin District of the Generalgouvernement) to implement a plan to systematically murder all Jews residing in the Generalgouvernement. In 1942, this project received the code name "Operation Reinhard" (Einsatz Reinhard), a reference to Heydrich (who had been authorized to manage the implementation of the "Final Solution" and who was assassinated by Czech agents in May 1942 in Prague).
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.