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D. P. Walker (1914-1985) was trained at Oxford and spent most of his career at the Warburg Institute of the University of London. His other books are The Decline of Hell (1964), The Ancient Theology (1972), and Unclean Spirits: Possession and Exorcism in France and England in the Late Sixteenth and Early Seventeenth Centuries (1981).
"Spiritual and Demonic Magic remains the basis of contemporary scholarly understanding of the theory of magic in postmedieval Europe." --Brian Copenhaver, UCLA