Edmond Charles Gruss (born c. 1933) is an author and Professor Emeritus at The Master's College in Santa Clarita, California, where he also served as chairman of the History department in the 1970s. Books * The Jehovah’s Witnesses and Prophetic Speculation, 1972 * What About the Ouija Board?, 1973 * We Left Jehovah's Witnesses: Personal Testimonies, 1974 * The Ouija Board: Doorway to the Occult, 1975, 1994 * Apostles of Denial: An Examination and Exposé of the History, Doctrines, and Claims of the Jehovah’s Witnesses, 1975 * What Every Mormon Should Know, 1976 * The Ouija Board, 1986 * Cults and the Occult, 1994 * The Jehovah’s Witnesses: Their Claims, Doctrinal Changes, and Prophetic Speculation, 2001 * The Four Presidents of the Watch Tower Society: Jehovah's Witnesses, 2003 * What Every Mormon (and Non-Mormon) Should Know, 2006
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