Susanne Bennett, MSW, PhD, is Associate Professor at National Catholic School of Social Service at The Catholic University of America, in Washington, DC. Her teaching in the MSW and PhD programs includes a course titled Attachment and neurobiology: Implications for social work practice and policy. She has published over a dozen articles on attachment processes, and her research focuses on the examination of attachment in caregiving relationships, particularly in social work supervision, elder care, and adoptive families. Dr. Bennett is a Distinguished Social Work Scholar in the National Academy of Practice and has maintained a psychotherapy practice for over 30 years. Judith Kay Nelson, MSW, PhD, is on the faculty of The Sanville Institute for Clinical Social Work and Psychotherapy, a Ph.D. program in California, where she teaches attachment and the neurobiology of attachment. She has been in private practice for 35 years, specializing in long-term psychotherapy. She has spent many years studying, writing, teaching, and presenting throughout the United States and Europe on topics related to crying, laughter, and attachment. She is the author of Seeing through tears: Crying and attachment, published by Routledge in 2005, and numerous articles and chapters on crying, laughter, and attachment. She is currently working on a new book, What made Freud laugh? An attachment perspective on laughter. Dr. Nelson is a Distinguish Social Work Practitioner in the National Academy of Practice.