Dr. Sullivan has 22 years of experience in HIV epidemiology and prevention in men who have sex with men, in the United States and in international settings. He worked in the Centers for Disease Control and Prevention (CDC) for 12 years, including service as an Epidemic Intelligence Service Officer, a Branch Chief, and Acting Deputy Division Director in the Division of HIV AIDS Prevention. He also has experience in design and oversight of biomedical prevention trials, having served as the Associate Director of Scientific Support for the NIH-funded HIV Vaccine Trials Network. He is currently the PI of several NIH-supported research grants to develop improved methods for online HIV prevention studies. Dr. Sullivan holds a PhD in Comparative and Experimental Medicine and a Doctor of Veterinary Medicine (DVM) from the University of Tennessee.