Since 2005, David Holtgrave, PhD, has been a professor and Chair of the Department of Health, Behavior and Society at the Johns Hopkins Bloomberg School of Public Health. He also holds joint appointments in the Johns Hopkins schools of medicine and nursing. Dr. Holtgrave has worked extensively in the field of HIV prevention since 1991. His research has focused on the effectiveness and cost-effectiveness of HIV prevention interventions and the translation of those study findings to HIV prevention policy. Dr. Holtgrave served as a member and vice-chair of the Presidential Advisory Council on HIV/AIDS (PACHA) during the Administration of President Barack Obama. Dr. Holtgrave testified before the U.S. House of Representatives during Representative Henry Waxman’s hearing on domestic HIV Prevention in 2008. Prior to his current position at Johns Hopkins University, Dr. Holtgrave was a professor at the Rollins School of Public Health at Emory University. He also served as director of the Division of HIV/AIDS Prevention – Intervention Research and Support at the U.S. Centers for Disease Control and Prevention (CDC), as well as on the faculty at the Center for AIDS Intervention Research at the Medical College of Wisconsin. He has authored or co-authored over 230 peer-reviewed professional publications, along with numerous book chapters and editorials. He edited The Handbook of Economic Evaluation for HIV Prevention Programs (Plenum Press, 1998). Along with a number of colleagues from AIDS United and Johns Hopkins University, he is a co-author of the book, “Improving Access to HIV Care: Lessons from Five U.S. Sites” (Johns Hopkins University Press).