Robert Simmons has been working with crystals and stones for over 35 years. He is the cofounder of Heaven and Earth, a company offering gem and jewelry creations for self-healing and spiritual and emotional development. The author of several books, including The Alchemy of Stones, he lives in New Zealand. Naisha Ahsian, now known as Samaya K. Aster, is an author, teacher, and healer with an international practice. She is the creator of Crystal Resonance Therapy and Primus Activation Healing Technique and is the director of the Crystalis Institute for Personal and Planetary Evolution, an educational organization founded in 1994 offering training and certification for healers worldwide. She lives in Sedona, Arizona. Hazel Raven, former Vice Chairman of ACHO (Affiliation of Crystal Healing Organizations), is an international writer, teacher, and practitioner of complementary therapies. She has been teaching professional crystal programs since 1990 and is the author of Angel Healing and Healing Yourself with Crystals.