Paul M. Lehrer, PhD, BCB, is Professor Emeritus of Psychiatry at Rutgers Robert Wood Johnson Medical School. Dr. Lehrer’s research interests include the mechanisms and applications of heart rate variability biofeedback; mind–body medicine; respiratory psychophysiology; and the clinical and physiological effects of relaxation therapies. His publications include 200 journal articles and book chapters. He is Associate Editor of the journal Applied Psychophysiology and Biofeedback, an Honorary Fellow of the Association for Applied Psychophysiology and Biofeedback, and a Fellow of the American Psychological Association and the Association for Behavioral and Cognitive Therapies. Dr. Lehrer is a recipient of the Lifetime Achievement Award, Outstanding Service Award, and Distinguished Scientist Award from the Association for Applied Psychophysiology and Biofeedback. Robert L. Woolfolk, PhD, is Professor of Psychology and Philosophy at Rutgers, The State University of New Jersey. He has served on the faculties of Princeton University and the University of Texas at Austin. His research interests include psychopathology and psychotherapy, the philosophical foundations of psychology, and the treatment of somatoform disorders, and he has published widely in these areas. Dr. Woolfolk has maintained an active clinical practice since the 1970s. Drawing from a variety of therapeutic approaches, he has conducted therapy with individuals, couples, families, and groups. He is a past editor of the Journal of Theoretical and Philosophical Psychology.