Ernst Haeckel had initially practiced medicine before he gained an interest in Charles Darwin’s theory and began exploring zoology and related fields. He not only coined terms such as ecology, but also named numerous species and created a genealogical tree. He drew numerous figures of animals and sea creatures, too.
Theodor Schwann was a German physiologist and physician best remembered for his important contributions to biology. He is credited with discovering the Schwann cells, which is named after him. He is also credited with discovering pepsin and the organic nature of yeast. Theodor Schwann also invented the term metabolism.
Christiane Nüsslein-Volhard is a German developmental biologist. She studied at the University of Tübingen where she earned a Ph.D. for her research on protein–DNA interactions. Together with biologist Eric Wieschaus and geneticist Edward B. Lewis, she received the Nobel Prize in Physiology or Medicine in 1995. She is also a recipient of the Gottfried Wilhelm Leibniz Prize.