Klaus Werner Max Zwilsky was born on August 16, 1932, in Berlin, Germany, to Erich and Ruth Herzberg Zwilsky. In October 1943, Klaus and his parents were ordered to move to the Jewish Hospital Berlin as Erich was the only remaining pharmacist in Berlin. The physicians, nurses, staff, and their families were permitted to stay in the hospital but most of them expected to be deported at a moment’s notice because the hospital also served as a deportation holding camp (Sammellager) for Jews prior to them being sent to ghettos and death camps. The Jewish Hospital survived the bombing raid on Berlin largely intact; it was liberated by the Soviet Army on April 24, 1945. Approx. 800 Jewish residents remained in the hospital, including Klaus and his parents. Theirs was not a story of hiding but one of survival in plain sight. The Jewish Hospital in Berlin was the only Jewish institution in Nazi Germany that remained operational throughout the war. It is an extraordinary and little-known story. On July 1, 1945, Klaus returned to the third grade at a Jewish school. He was the first Bar Mitzvah in Berlin after the war.