Ernst Gräfenberg Ernst Gräfenberg Ernst Gräfenberg (September 26, 1881 in Adelebsen near Göttingen, Germany – 28 October 1957 in New York City, United States) was a German-born physician (medical doctor) and scientist. He is known for developing the intrauterine device (IUD), and for his studies of the role of the woman's urethra in orgasm. The G-spot is named after him. Gräfenberg studied medicine in Göttingen and Munich, earning his doctorate on 10 March 1905. He began working as a doctor of ophthalmology at the university of Würzburg, but then moved to the Department of Obstetrics and Gynaecology at the University of Kiel,
Ernst Fränkel (physician) Ernst Fränkel (physician) Ernst Fränkel, Ernst Fraenkel (5 May 1844 in Breslau – 19 March 1921) German physician (gynecologist). He was the nephew of Ludwig F. Fränkel (1806–1872), German physician. He studied medicine at the universities of Berlin, Vienna, and Breslau (M.D. 1866). He took part in the Austro-Prussian war in 1866 and in the Franco-Prussian war in 1870–1871 as assistant surgeon. In 1872 he established himself as physician, especially as accoucheur and gynecologist, in his native town. In 1873 he became "privatdozent" at the Breslau University, and in 1893 honorary professor. He took an active part in the politics