City Readers Digital Historic Collections at the New York Society Library

Paracelsus (/ˌpærəˈsɛlsəs/; late 1493 – September 24, 1541), born Philippus Aureolus Theophrastus Bombastus von Hohenheim, was a Swiss German philosopher, physician, botanist, astrologer, and general occultist. He is credited as the founder of toxicology. He is also a famous revolutionary for utilizing observations of nature, rather than referring to ancient texts, something of radical defiance during his time. He is credited for giving zinc its name, calling it zincum. Modern psychology often also credits him for being the first to note that some diseases are rooted in psychological conditions.

Paracelsus' most important legacy is likely his critique of the scholastic methods in medicine, science and theology. Much of his theoretical work does not withstand modern scientific thought, but his insights laid the foundation for a more dynamic approach in the medical sciences.