Dr. Bill Hanage is an Associate Professor of Epidemiology and Associate Director of the Center for Communicable Disease Dynamics at Harvard T. H. Chan School of Public Health. His research and teaching focus on the epidemiology of infectious disease and the evolution of infectious agents. He received his PhD from Imperial College London. Dr. Hanage has made seminal contributions to the study of diverse pathogens, both bacteria and viruses, and has a special interest in evolution in response to interventions such as vaccination or antimicrobials. His research on the current pandemic has included modeling transmission in healthcare and the impact of vaccination in the context of variants, how fatality rates vary with age, and how the virus evolves in individual hosts. His awards include the Fleming Prize from the Microbiology Society and a young investigator award from the American Society for Microbiology. He has published more than 200 scientific articles and book chapters and is a regular contributor to popular media aiming to improve public understanding of the SARS-CoV-2 pandemic and other infectious diseases.