Dr. John Dee (1527–1608), Queen Elizabeth I's court advisor and astrologer, was the foremost scientific genius of the 16th century. Laying the foundation for modern science, he actively promoted mathematics and astronomy as well as made advances in navigation and optics that helped elevate England to the foremost imperial power in the world. Centuries ahead of his time, his theoretical work included the concept of light speed and prototypes for telescopes and solar panels. But, as Jason Louv explains, Dee was suppressed from mainstream history because he spent the second half of his career developing a method for contacting angels. After a brilliant ascent from star student at Cambridge to scientific advisor to the Queen, Dee, with the help of a disreputable, criminal psychic named Edward Kelley, devoted ten years to communing with the angels and archangels of God. These spirit communications gave him the keys to Enochian, the language that mankind spoke before the fall from Eden. Presenting a comprehensive overview of Dee's life and work, Louv examines his scientific achievements, intelligence and spy work, imperial strategising and Enochian magick, establishing a psychohistory of John Dee as a singular force and fundamental driver of Western history. Exploring Dee's influence on Sir Francis Bacon, the development of modern science, 17th-century Rosicrucianism, the 19th-century occult revival and 20th-century occultists such as Jack Parsons, Aleister Crowley and Anton LaVey, Louv shows how John Dee continues to impact science and the occult to this day. · Presents an overview of Dee's scientific achievements, intelligence and spy work, imperial strategising and his work developing methods to communicate with angels · Pieces together Dee's fragmentary Spirit Diaries and examines Enochian in precise detail and the angels' plan to establish a New World Order · Explores Dee's influence on Sir Francis Bacon, modern science, Rosicrucianism, and 20th-century occultists such as Jack Parsons, Aleister Crowley and Anton LaVey