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 Hartmann himself, together with his brother Robert, with geobiology and dowsing. Furthermore, he occupied himself with homeopathy and later also biology. The Research Group for Geobiology (Dr. Hartmann e.V.), a registered association, was founded by him. Ernst Hartmann Ernst Hartmann (10 November 1915 in Mannheim - 23 October 1992 in Waldkatzenbach, a suburb of Waldbrunn (Odenwald)) in Germany was a German medical doctor, author and publicist. "Hartmann lines" are named after him. After leaving school, Ernst Hartmann studied medicine in Mannheim and Jena. During World War II he worked as a staff physician and was in American captivity. After his return