Dr. Elizabeth "Betz" Halloran is a world leader in using mathematical and statistical methods to study infectious diseases and a pioneer in the design and analysis of vaccine studies. She is director of the Summer Institute in Statistics and Modeling in Infectious Diseases (SISMID). She is also the director for the Center for Inference and Dynamics of Infectious Diseases. Headquartered at Fred Hutch, this center helps the federal government understand and prepare for infectious-disease outbreaks. She is also head of the Program in Biostatistics, Bioinformatics and Epidemiology in Fred Hutch’s Vaccine and Infectious Disease Division. Her work is used to develop strategies to stop outbreaks of serious global threats such as Zika virus disease, Ebola virus disease, influenza, COVID-19, cholera and dengue fever.