Mark A. Mattaini is associate professor at the Jane Addams College of Social Work, University of Illinois at Chicago. Editor of the scientific journal Behavior and Social Issues, he is the author or editor of ten books, including PEACE POWER for Adolescents: Strategies for a Culture of Nonviolence (NASW Press) and Finding Solutions to Social Problems: Behavioral Strategies for Change (American Psychological Association). Mattaini is the principal developer of the behavior analytic PEACE POWER strategy, which has been presented and implemented in at least twelve American states, as well as two Canadian provinces, and was recently introduced in a UNESCO-funded project in Brazil.