Dr. Jennifer Layden is a prominent public health physician and data expert who recently resigned as Director of the Centers for Disease Control and Prevention's (CDC) Office of Public Health Data, Surveillance, and Technology (OPHDST) in August 2025, alongside other senior officials. She previously held key roles in the COVID-19 response, served as Chief Medical Officer for the Chicago and Illinois Departments of Public Health, and is recognized for her work on public health data modernization and infectious disease response.