English mathematician, astronomer, and author John Dee (1527 - 1608) was a renowned intellectual of Renaissance - era England. An author of 49 books, his interests included science and mathematics, as well as alchemy, astrology, divination, and Rosicrucianism. In addition, he served as a consultant to Queen Elizabeth, and he advised English explorers on their voyages to North America. Today, his occult activities tend to overshadow his many substantialaccomplishments, but the remarkable scholar was a true example of a "Renaissance Man."