Daniel Hughes, PhD, is a clinical psychologist and author who developed Dyadic Developmental Psychotherapy. He lives in Annville, Pennsylvania. Jonathan Baylin, PhD, a psychologist in private practice, offers workshops for therapists on integrating knowledge about the brain with psychotherapy. Daniel J. Siegel, MD, a noted neuropsychiatrist and bestselling author,?is the cofounder of Mind Your Brain, the founder and director of education of the Mindsight Institute, and founding codirector of the Mindful Awareness Research Center at UCLA. He resides in Santa Monica, California.