Mary Ellen joined the Department of Neuropsychiatry and Behavioral Science in 2006 following a twelve-year appointment as Assistant Professor of Clinical Pediatrics at USC Developmental Pediatric Clinic. Dr. Warren holds an Honours Bachelor of Arts in Psychology from the University of Western Ontario as well as a Master of Arts and Doctorate in School Psychology from the University of South Carolina. Dr. Warren is a licensed psychologist with special interests in infant/early childhood mental health. She is a ZERO TO THREE Leaders for the 21st Century fellow (2007-2009) with certification in two evidence-based parenting interventions: PCIT (Parent Child Interaction Therapy) and Triple P (Positive Parenting Program). As an Associate Professor of Clinical Neuropsychiatry and Behavioral Science at USC-SOM, Dr. Warren provides direct treatment to young children that supports the primary care-giving relationship and their overall mental health. Research interests include  parenting interventions, early childhood mental health, workforce development, and interdisciplinary training.