M. Basil Pennington, OCSO, was a monk for more than fifty years. He lived at St. Joseph's Abbey in Spencer, Massachusetts and was the author of many modern spiritual classics, including Lectio Divina and Centering Prayer.

Thomas Keating, OCSO, is a monk, priest and former abbot who currently lives at St. Benedict's Monastery in Snowmass, Colorado. His books include Open Mind, Open Heart; Intimacy with God and many others.

Thomas E. Clarke, SJ, is a well-known Jesuit writer and spiritual father. He now resides at Bethany Retreat Center in Highland Mills, New York.

Rev. Cynthia Bourgeault, PhD, is an Episcopal priest and retreat leader focusing in Christian Spirituality. She is principal teacher for the Contemplative Society in Victoria, British Columbia, and founding director of the Aspen Wisdom School in Aspen, Colorado. Her books include Centering Prayer and Inner Awakening, The Wisdom Way of Knowing, Encountering the Wisdom Jesus, Mystical Hope and Love Is Stronger than Death. She serves on the core faculty for the Spiritual Paths Foundation whose mission is to promote curiosity, respect and acceptance between people of diverse spiritual traditions.