Z'ev ben Shimon Halevi (English name, Warren Kenton) is an author of books on the Toledano Tradition of Kabbalah, a teacher of the discipline, with a worldwide following, and a founder member of the Kabbalah Society.
Good intro to the topic. Not sure iof the author's feelings of using Judaism to understand this Jewish topic.... overall nice read. Well-illustrated. Very much worth the dollar it cost me.