One aspect of Renaissance natural philosophy was the rise of "natural magic." Its goal was to understand the correspondences and powers God had implanted in the world and to make use of them, but relied on topics in science and technology. This lecture showcases three "magi" of the Renaissance: Agrippa von Nettesheim, the humanist author of a major compendium of magic; Paracelsus, the hot-tempered Swiss medical writer and iconoclast; and John Dee, the English mathematician who asked angels to tell him the secrets of God's creation.