Bernard Spilka, PhD, is Professor Emeritus of Psychology at the University of Denver. He has been president of the Colorado Psychological Association, the Rocky Mountain Psychological Association, and Division 36 (Society for the Psychology of Religion and Spirituality) of the American Psychological Association, and vice president of the Society for the Scientific Study of Religion. Dr. Spilka is a recipient of the Scholar/Teacher Award from the United Methodist Church; the William James Award, Mentoring Award, and Distinguished Service Award from Division 36; and Distinguished Service Awards from the Colorado and Rocky Mountain Psychological Associations. Continuing to write professionally, he is author, coauthor, editor, or coeditor of nine books, one monograph, and two major federal reports.

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Kevin L. Ladd, PhD, is Professor of Psychology at Indiana University South Bend and former pastor of United Methodist and Presbyterian (PCUSA) congregations. A consulting editor for journals including the Journal of Social Psychology, Archive for the Psychology of Religion, and Psychology of Religion and Spirituality, he also serves on the Board of Directors of the International Association for the Psychology of Religion. Dr. Ladd's research on the psychology of prayer has involved collaborations, publications, and lectures in China, Europe, India, and South America.