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John Dee was a mathematician, astronomer, astrologer, geographer and consultant to Elizabeth I, born in the Tower ward of the City of London in 1527. He also devoted much of his life to alchemy, divination, and Hermetic philosophy. Dee straddled the worlds of science and magic. One of the most learned men of his time, he was lecturing to crowded halls at the University of Paris in his early twenties. He was an ardent promoter of mathematics, a respected astronomer and a leading expert in navigation, training many of those who would conduct England's voyages of discovery. At the same time, he immersed himself deeply in Christian angel-magic and Hermetic philosophy, and devoted the last third of his life almost exclusively to these pursuits. For Dee, as for many of his contemporaries, these activities were not contradictory, but aspects of a consistent world-view.