Steven Nisenbaum, Ph.D., J.D. is a clinical psychologist, mediator, guardian ad litem and expert witness in Massachusetts. He has an appointment to the Medical Staff at MGH in Psychiatry (Harvard Medical School) for over 40 years, and is a Clinical Assistant Professor at Tufts Medical School in the Comprehensive Family Evaluation Center. He is Past President of the Massachusetts Psychological Association (MPA), Past President of the MA Chapter of the Association of Family and Conciliation Courts(AFCC-MA), and Past President of American Psychological Association (APA) Div. 18 (Public Service), and Past Member APA Ethics Committee. Dr. Nisenbaum is on the Board of Directors of the Massachusetts Council of Family Mediators (MCFM) and of the Harvard Law School Association of Massachusetts (HLSA-MA), and a Member of the Massachusetts Association of Guardians Ad Litem (MAGAL). He received the Ezra Saul Award for Distinguished Contributions from the MPA.