Oswald Wirth (1860-1943) was a Swiss occultist, artist and author. He was a student of Elphaas Levi and was mentored by Stanislas de Guaita.

Mary K. Greer is a Grandmaster of the American Tarot Association and teaches workshops and classes on Tarot and astrology throughout the U.S. and abroad. She is the author of several books, including 21 Ways to Read a Tarot Card and Tarot for Your Self. This book is a revision of Mary Greer's Tarot Constellations. Visit her at: www.marygreer.wordpress.com