William (Bill) Miller, MD, PhD, MPH is an infectious diseases epidemiologist. He has worked with state, local, and university officials to help craft responses to the COVID-19 pandemic. In normal times, he studies sexually transmitted infections, HIV infection, and substance use. His work has included observational and interventional studies in areas such as partner services, spatial epidemiology, sexual and social networks, improving surveillance data, and access to HIV and substance use services. He currently leads studies in the U.S., Vietnam, and Malawi. He also serves as editor-in-chief for the journal Sexually Transmitted Diseases and associate editor for Epidemiology.