Otmar Freiherr von Verschuer was a German human biologist and eugenicist concerned primarily with "racial hygiene" and twin research. He received Heinrich Himmler's permission to work in Auschwitz from 1944 on. One of Verschuer's best known assistants was Josef Mengele, who, as one of the SS physicians at the Auschwitz death camp, later became known as the "Angel of Death". In this photo, Verschuer (rear) supervises anthropometric measurements. A Nazi war criminal,Verschuer was never tried.