Dr. Stefan Wiktor, MD is a professor in the Department of Global Health at the University of Washington Schools of Medicine and Public Health where he oversees projects related to testing and treatment of HIV and hepatitis in resource-limited countries, primarily in Africa. He is a public-health physician with thirty years’ experience in epidemiologic research and in the implementation of public-health programs for the control of infectious diseases. Dr. Wiktor has worked at the U.S. National Cancer Institute, the U.S. Centers for Disease Control and Prevention, and the World Health Organization in Geneva. At these organizations, he has led teams that have conducted a wide range of epidemiologic research studies in Africa, with a focus on the prevention of mother-to-child transmission of HIV and antibiotic prophylaxis as well as heading programs that expanded access to HIV prevention and treatment services in Tanzania. As the Team Lead of the World Health Organization’s Global Hepatitis Programme, he led the development of several guidelines and policy documents and assisted countries in the implementation of comprehensive viral hepatitis prevention and control programs. His work culminated in the first-ever WHO global strategy for the control of hepatitis.