Hadassa Rosensaft was born on August 26, 1912, in Sosnowiec, Poland. She studied dentistry at the University of Nancy, in France. Rosensaft graduated in 1935, with a degree in dental surgery. She soon returned to Sosnowiec, where she found employment as a dentist. On August 2, 1943, Rosensaft was deported to Auschwitz concentration camp. While at the camp, she worked as a doctor under Josef Mengele. In her doctoring, Rosensaft saved many lives by smuggling medical materials to them, and doctoring and disguising their wounds.