Shaun is an Assistant Scientist in the Departments of International Health and Epidemiology. His work focuses on applying infectious disease dynamics and modeling for direct public health response, decision making, and policy, particularly for COVID-19, influenza, and vaccine-preventable diseases. He co-leads the US Scenario Modeling Hubs, a consortium of researchers producing longer-term scenario projections to guide public health response and policy. He also is a core faculty member of the International Vaccination Access Center (IVAC), where he conducts research to better understand gaps in immunity to vaccine preventable diseases and what strategies we might use to close those gaps. Shaun earned his PhD in epidemiology from Johns Hopkins Bloomberg School of Public Health and a BS and MPH from University of Wisconsin-Madison.