Since joining the faculty at the Institute for Child Study, Department of Human Development at the University of Maryland in 1973, Dr Robert Marcus has balanced his academic duties with his work in the community. Dr Marcus holds a Ph.D. in human development and family studies from the Pennsylvania State University, and completion of his dissertation was supported by a grant from the National Science Foundation. Dr Marcus has authored more than forty articles and presented over fifty of his works at meetings around the country. Interested in counseling children and adolescents early in his career, as a Psychology Junior Fellow for the New Jersey Department of Institutions and Agencies, and as a school psychologist in New Jersey, Dr Marcus became a licensed psychologist in Maryland in 1979. A clinical practice working with aggressive children and adolescents complemented his academic interests. Since developing the course 'Adolescent Violence' in 1993, his interests started forming into this book. Currently, Dr Marcus is a Practice Associate of Sheppard Pratt Hospital in Baltimore, with an assignment at their satellite clinic in Columbia, Maryland.