Violence in schools and communities is no longer an urban school problem; it is every school's problem ( Garbarino, 1999 ). What factors cause children to interact with increasingly violent and anti-social behaviors? What strategies can teachers and schools use in order to help these childhood bullies who grow up to be violent youths? This paper examines the life of Jeffrey, a fictional young man created to personalize the effects that the environment, both home and school, has on the development of anti-social and violent behaviors. Follow Jeffrey from birth, through the early years, into middle school, and, finally, high school and observe the development of increasingly anti-social and violent behaviors, as well as explore classroom and school interventions that may have helped Jeffrey, and others like him, learn appropriate prosocial skills. Through Jeffrey, I examine the development of anti-social and violent behaviors at four key developmental levels and address intervention strategies and programs that have demonstrated an increase in prosocial behaviors.