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 Büchner Anton Büchner (28 July 1887 – 27 August 1985), the first biographer of the Büchner siblings. Ernst Büchner Ernst Büchner (18 March 1850 – 25 April 1924) was the German industrial chemist after whom the Büchner flask and Büchner funnel are named. The patent for his two inventions was published in 1888. His father was the pharmacist, chemist, industrialist and politician Wilhelm Büchner. Ernst was also the nephew of the playwright Georg Büchner and the philosopher, physiologist and physician Ludwig Büchner. Büchner studied chemistry in Tübingen. In his dissertation, he addressed the issue of separation of Chlorbromanilins. In 1882, Ernst