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 Hans Ludwig Krause Ernst Hans Ludwig Krause Ernst Hans Ludwig Krause (27 July 1859, Stade – 1 June 1942, Domjüch/Neustrelitz) was a German physician, botanist and mycologist. He studied medicine and botany in Berlin, where in 1881 he received his medical doctorate. From 1882 to 1893 he served as a naval medical officer, and later spent several years as a physician to an infantry regiment. From 1904 to 1918 he gave lectures on plant systematics and phytogeography at the University of Strasbourg, and afterwards, relocated to the University of Rostock, where from 1921 to 1933, he was an associate professor of botany. From