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Stephen S. Leff, PhD


Associate Professor of Clinical Psychology in Pediatrics, University of Pennsylvania

Co-Director of the Violence Prevention Initiative at The Children's Hospital of Philadelphia

Dr. Leff is an Associate Professor of Clinical Psychology in Pediatrics at the University of Pennsylvania School of Medicine and a Psychologist at The Children’s Hospital of Philadelphia. He is the Co-Director of the new Violence Prevention Initiative at CHOP, and is a nationally recognized leader in aggression and bullying prevention programming, relational aggression (use of rumors and social exclusion to harm others), and the community-based participatory research (CBPR) process (working with community stakeholders to integrate their perspectives into best practice programming). He has been awarded five NIH grants and a Department of Education grant to support his aggression and bullying prevention programs in the urban schools. He lectures frequently both regionally and nationally, is on the Editorial Advisory Board for two leading journals, serves on two federal Review panels, and is a member of the National Bullying Research Network. He also is an Attending Psychologist in the ADHD Program at CHOP.

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