Johann Friedrich Schweitzer or Sweitzer, usually known as Helvetius, was a Dutch physician and alchemical writer of German extraction. He is known for his books Ichts aus Nichts, für alle Begierigen der Natur published in 1655, Vitulus Aureus, published in 1667 under the pseudonym Joakim Philander, and Miraculo transmutandi Metallica, Antwerp, 1667.
- Occupation
- physician, chemist, non-fiction writer, botanist
- Citizenship
- Germany, Dutch Republic
- Born
- January 17, 1630, 1625, 1630
- Died
- August 29, 1709, 1709
