Stanislav Grof, MD, is a psychiatrist who teaches at California Institute of Integral Studies and is the founder of the International Transpersonal Association. He is the author and editor of many books, including Psychology of the Future: Lessons from Modern Consciousness Research; The Cosmic Game: Explorations of the Frontiers of Human Consciousness; Human Survival and Consciousness Evolution; The Adventure of Self-Discovery: Dimensions of Consciousness and New Perspectives in Psychotherapy and Inner Exploration; Beyond the Brain: Birth, Death, and Transcendence in Psychotherapy; and Ancient Wisdom and Modern Science, all published by SUNY Press.

Christina Grof, PhDhc, is cocreator of Holotropic Breathwork, founder of the Spiritual Emergence Network (SEN), and the author of many books, including Beyond Death: The Gates of Consciousness; Spiritual Emergency: When Personal Transformation Becomes a Crisis; The Stormy Search for the Self: A Guide to Personal Growth through Transformational Crisis (all with Stanislav Grof), and The Thirst for Wholeness: Attachment, Addiction, and the Spirit. They reside in Mill Valley, California.