Marion Solomon, PhD, is a lecturer at the David Geffen School of Medicine, Department of Psychiatry at UCLA. She is co-editor with Dan Siegel of several books in the IPNB Series, including Healing Trauma and How People Change. Stan Tatkin, PsyD, MFT, developer of a Psychobiological Approach To Couple Therapy® (PACT), maintains a private practice in Calabasas, California, and runs therapist training programs in Los Angeles, San Francisco, Seattle, and Austin. As assistant clinical professor at the UCLA David Geffen School of Medicine, Department of Family Medicine, Dr. Tatkin teaches and supervises family medicine residents, and serves as adjunct faculty for several colleges and universities.