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 Platner (unconscious). He is also credited for coining the phrase "pragmatic history of the human faculty of cognition" ("pragmatische Geschichte des menschlichen Erkentnißvermogens"), later appropriated by Johann Gottlieb Fichte as "pragmatic history of the human spirit" ("pragmatische Geschichte des menschlichen Geistes"). Ernst Platner Ernst Platner (; ; 11 June 1744 – 27 December 1818) was a German anthropologist, physician and Rationalist philosopher, born in Leipzig. He was the father of painter Ernst Zacharias Platner (1773–1855). Following the death of his father in 1747, the philologist Johann August Ernesti became his foster father. He received his early education at the gymnasium in