Stephen S. Leff, PhD, is a psychologist in the Department of Child and Adolescent Psychiatry and Behavioral Sciences and Co-Director of the Violence Prevention Initiative at Children's Hospital of Philadelphia.
Areas of Expertise:
Aggression and bullying prevention programming, ADHD and peer relations, Community-based participatory research models for intervention and measurement development, Gender and social cognitive differences in aggression Appointments and Referrals: 1-800-TRY-CHOP(1-800-879-2467)
Dr. Leff is a Professor of Clinical Psychology in Pediatrics and Psychiatry at the University of Pennsylvania School of Medicine and a psychologist at Children’s Hospital of Philadelphia. He is the Co-Director of the 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 six NIH grants, a National Science Foundation grant, a Department of Education grant, and a number of local foundation awards 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 several leading journals, serves on federal Review panels, and is a member of the Pennsylvania Bullying Prevention Partnership and the National Bullying Research Network. He also is an attending psychologist in the ADHD Program at CHOP.
Education and Training
Philadelphia Child Guidance Center, Philadelphia, PA
Children's Seashore House of The Children's Hospital of Philadelphia, Philadelphia, PA
BA - Duke University, Durham, NC
PhD - University of North Carolina, Chapel Hill, NC
Titles and Academic Titles
Co-Director of the Violence Prevention Initiative at Children's Hospital of Philadelphia
William H. Bennett Professor of Pediatrics, University of Pennsylvania Perelman School of Medicine
Professor of Clinical Psychology in Pediatrics and Psychiatry, Perelman School of Medicine at the University of Pennsylvania
Aggression prevention programming
Gender and social cognitive differences in aggression
Social skills promotion
Mehari, K.R., Moore, W., Waasdorp, T.E., Varney, O., Berg, K., & Leff, S.S.: Cyberbullying Prevention: Insight and Recommendations from Youth, Parents, and Pediatricians. Child: Care, Health & Development. Page: 1-7, 2018 Notes: DOI:10.1111/cch.12569.
Leff, S.S., Streit, K.V., & Paskewich, B.S.: Supporting Urban Youth through Play: Facilitating Social and Emotional Skills. Promoting Prosocial Behaviors in Children through Games and Play: Making Social Emotional Learning Fun. Laura Nabors & Renee Hawkins (eds.). Nova Science, Page: 147-175, 2018.
Bradshaw, C. P., O'Brennan, L.M., Waasdorp, T.E., Pas, E., Blumenstyk, J., Bartolo, D., & Leff, S. S.: The New Frontier: Leveraging Innovative Technologies to Prevent Bullying. Cambridge Handbook of Violence Behavior and Aggression (2nd Ed.). A. Vazsonyi, D. Flannery, & M. Delisi (eds.). Page: 724-735, 2018 Notes: 2nd edition.
Waasdorp, T.E., Horowitz-Johnson, Z., & Leff, S.S.: Cyberbullying across the lifespan: Risk factors and consequences. Handbook of Bullying Prevention: A Lifecourse Perspective. C.P. Bradshaw (eds.). National Association of Social Workers (NASW) Press, Page: 69-80, 2017.
Leff SS, Waasdorp TE, Waanders C, Paskewich BS. Better understanding and intervening to prevent relational aggression. In: Weist MD, Lever NA, Bradshaw CP, Owens JS, editors. Handbook of School Mental Health: Research, Training, Practice, and Policy, 2nd ed. New York: Springer; 2014. p. 171-84.
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