Ronet Bachman, PhD, is a professor in the Department of Sociology and Criminal Justice at the University of Delaware. She is coauthor of Statistical Methods for Crime and Criminal Justice (3rd ed.) and coeditor of Explaining Crime and Criminology: Essays in Contemporary Criminal Theory. In addition, she is author of Death and Violence on the Reservation and coauthor of Stress, Culture, and Aggression in the United States; and Violence: The Enduring Problem as well as numerous articles and papers that examine the epidemiology and etiology of violence, with a particular emphasis on women, the elderly, and minority populations. Her most recent federally funded research was a mixed-methods study that investigated the long-term trajectories of offending behavior using official data of a prison cohort released in the early 1990s and then interviewed in 2009.