Robert Simmons is author of Moldavite: Starborn Stone of Transformation, Earthfire: A Tale of Transformation, The Book of Stones, Stones of the New Consciousness, and The Alchemy of Stones.

Doug Marman, an Eckankar practitioner, is author of The Whole Truth: The Spiritual Legacy of Paul Twitchell; It Is What It Is: The Personal Discourses of Rumi; The Hidden Teachings of Rumi; The Silent Questions: A Spiritual Odyssey; The Spiritual Flow of Life and the Science of Catalysts; Sukhmani: The Secret of Inner Peace; and [...]