G. David Curry received his Ph.D. in Sociology from the University of Chicago, where he also completed a postdoctoral fellowship in evaluation research. He has published extensively in the areas of gangs and violence, and has received funding by several federal agencies to study gang problems. Scott H. Decker received his Ph.D. in Criminology from Florida State University. He is coauthor of Life in the Gang, as well as several articles dealing with gangs, drugs, and violence. Decker has received grants from a number of federal and state agencies to study gangs and evaluate gang programs.