English Paracelsian physicist, astrologer, and mystic. Son of Sir Thomas Fludd, a high-ranking governmental official. Between 1598 and 1604, Fludd studied medicine, chemistry and the occult on the European mainland. He was not a member of the Rosicrucians, as often alleged, but he defended their thoughts in the Apologia Compendiaria of 1616. Fludd is best known for his research in occult philosophy, presented in Utriusque Cosmi, Maioris scilicet et Minoris, metaphysica, physica, atque technica Historia, published in Germany between 1617 and 1621.