Matthew Steinfeld received his doctorate in clinical psychology from The New School for Social Research, and completed pre and postdoctoral fellowships in the Department of Psychiatry at Yale University’s School of Medicine. He has been a Fellow of the American Psychoanalytic Association and a Psychoanalytic Fellow at Columbia University’s Center for Psychoanalytic Training and Research. His scholarly, clinical, and research interests center on: clinical theory and technique in psychodynamic psychotherapy, the role of mentalization in growth and change processes, and the psychological and sociological correlates of substance use disorders. A classically trained musician, he has also conducted research on the psychodynamics of music making. A licensed clinical psychologist, he currently serves as an Instructor in Psychiatry at Yale’s School of Medicine, as a supervising psychologist at the Connecticut Mental Health Center’s Substance Abuse Treatment Unit, and has a psychotherapy private practice in New Haven, Connecticut.