German biologist (1795–1876).
Christian Gottfried Ehrenberg (19 April 1795 – 27 June 1876) was a German naturalist, zoologist, botanist, comparative anatomist, geologist, and microscopist. He was one of the most productive and renowned scientists of his time and a friend of the famous explorer Alexander von Humboldt. As a professor of medicine at the University of Berlin he was primarily interested in biology, naturalist studies and microscopy. His studies on micro-organisms led him to discover a number of protozoa, including the organisms giving the colour of the Red Sea, and he was among the first to suggest the separati