1. Ralph DiClemente is with the Department of Social and Behavioral Sciences, New York University College of Global Public Health, New York, NY. Azure Nowara, Rachel Shelton, and Gina Wingood are with the Lerner Center for Public Health Promotion and the Department of Sociomedical Sciences, Columbia University Mailman School of Public Health, New York, NY. Azure Nowara, Rachel Shelton, and Gina Wingood are also Guest Editors for this supplement issue.