Comparative anatomy
Edward Tyson is regarded as the founder of modern comparative anatomy. He is credited with determining that whales and dolphins are, in fact, mammals. Also, he concluded that chimpanzees are more similar to humans than to monkeys because of their arms. Marco Aurelio Severino also compared various animals, including birds, in his "Zootomia democritaea", one of the first works of comparative anatomy. In the 18th and 19th century, great anatomists like George Cuvier, Richard Owen and Thomas Henry Huxley revolutionized our understanding of the basic build and systematics of vertebrates, laying the foundation for Charles Darwin's work on evolution. An example of a 20th-century comparative anatomist is Victor Negus, who worked on the structure and evolution of the larynx. Until the advent of genetic techniques like DNA sequencing, comparative anatomy together with embryology were the primary tools for understanding phylogeny, as exemplified by the work of Alfred Romer.
Arthur Arnold Osman
Arthur Arnold Osman (24 May 1893 – 20 April 1972) was a British nephrologist. Osman was one of the first physicians to specialize entirely in the management of renal disorders; the first to recognize that nephrology needed to become a specialty (1930s); published profusely; the first physician to style himself a ‘nephrologist’ (1945); founded the first nephrological society in the world, the Renal Association (1950); and organized the first international meeting devoted entirely to the kidney and its diseases (1953)