Paracelsus (/ˌpærəˈsɛlsəs/; late 1493 – September 24, 1541), born Philippus Aureolus Theophrastus Paracelsus 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.