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 Stizenberger editor of the exsiccatae "Die Characeen Europas". Stizenberger is the taxonomic author of the genus "Anzia". Ernst Stizenberger Ernst Stizenberger (14 June 1827, Konstanz – 27 September 1895) was a German physician and lichenologist. He studied medicine at the University of Freiburg, afterwards furthering his medical training in Prague and Vienna. In 1851 he returned to Konstanz, where he worked as a general practitioner until his death in 1895. Throughout his career he had a passion for botany, especially lichenology. His principal works include a book on lichens native to Africa, "Lichenaea Africana" (1890–91), and studies of a lichenized genus