Charles L. Whitfield is a physician and psychotherapist in private practice in Atlanta.
Cardwell C. Nuckols, PhD, (Longwood, FL) is described as "one of the most influential clinical and spiritual trainers in North America." He has served the behavioral medicine field for 40 years and for the last 20 years is considered one of the leading experts in the world on addiction and recovery. Dr. Nuckols' background includes advanced work in such areas as medical research, pharmacology, neurobiology, education, and psychology. His personal spiritual path involves studies into various spiritual traditions predominately early Contemplative Christianity. He is widely published, having authored more than 30 books and workbooks.