Bernhard Zondek (July 29, 1891 - November 8, 1966) was a German-Jewish gynaecologist who developed the first reliable pregnancy test in 1928.Bernhard Zondek was born in Wronke, Germany. He studied medicine in Berlin, graduating in 1919. He worked under Karl Franz at the university women's clinic in Berlin Charité, where he specialised in obstetrics and gynecology. His older brother, Hermann Zondek, was a professor at University of Berlin and a pioneer of modern endocrinology.