Thomas J. Coates, PhD, is Distinguished Professor of Medicine and the Michael and Sue Steinberg Professor of Global AIDS Research at the UCLA David Geffen School of Medicine. He is also Director of the UCLA Center for World Health at UCLA David Geffen School of Medicine/UCLA Health System and Director of the University of California Global Health Institute. Prior to being at UCLA, he was at UCSF for 21 years where he co-founded the Center for AIDS Prevention Studies (CAPS) in 1986 and was the Founding Executive Director of the UCSF AIDS Research Institute in 1996. He was formerly the Co-Director of the NIH-funded HIV Prevention Trials Network (HPTN). He has conducted randomized trials to determine the efficacy and cost-effectiveness of HIV voluntary counseling and testing for individuals and couples in Kenya, Tanzania, and Trinidad and a 48-cluster randomized trial in South Africa, Zimbabwe, Tanzania, and Thailand to determine the impact of strategies for mobile HIV voluntary counseling and testing and for changing community norms on HIV incidence at the community level. He was elected to the National Academy of Medicine (formerly the Institute of Medicine) in 2000.