Daniel W. Webster, ScD, MPH, is a professor of Health Policy and Management at the Johns Hopkins Bloomberg School of Public Health, where he serves as Director of the Center for Gun Policy and Research, Deputy Director of Research for the Center for the Prevention of Youth Violence, and Director of the PhD program in Health and Public Policy. He has published numerous articles on the prevention of gun violence, firearm policy, youth gun acquisition and carrying, intimate partner violence, and the prevention of youth violence. Jon S. Vernick, JD, MPH, is an associate professor of Health Policy and Management at the Johns Hopkins Bloomberg School of Public Health and Co-Director of the Johns Hopkins Center for Gun Policy and Research. He is committed to translating research findings into policy change, regularly working with legislators, media, courts, and advocates to provide information about effective policies.