Robert E. Fullilove is with the Department of Sociomedical Sciences and Hancy Maxis is with the Department of Health Policy and Management, Mailman School of Public Health, Columbia University, New York, NY. Anibal Cortes and Richard Gamarra are with the New York City Department of Health and Mental Hygiene, New York, NY. Robert E. Fullilove is also a guest editor for this supplement issue.