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Martha Sweezy, PhD, is a part-time assistant professor in psychiatry at Harvard Medical School, a research and training consultant at the Center for Mindfulness and Compassion at the Cambridge Health Alliance, and a psychotherapist at a private practice in Northampton, Massachusetts. She has published articles on IFS in peer-reviewed journals, co-edited two books on various applications of IFS, and co-authored three treatment manuals on IFS (on trauma, couple therapy, and now addictions), as well as the second edition of Internal Family Systems Therapy with Richard Schwartz. Her next book, which explores shame and guilt in the context of psychic multiplicity, will be published by Guilford Press in 2023.