Madsen is an associate professor in the School of Public Health and the UC Berkeley-UC San Francisco Joint Medical Program. With funding from the National Institutes of Health, Robert Wood Johnson Foundation, American Heart Association, and other agencies, Madsen works to identify programs and policies that will reduce childhood obesity and its attendant health disparities. Projects include exploring the impact of California’s soda tax legislation on consumption, using student-friendly technology to improve nutrition in schools, and developing programs to combat childhood obesity, particularly for low-income populations. Madsen, who earned her B.A. from Berkeley and a joint M.P.H and M.D. from the University of Indiana, works closely with schools and community-based programs to improve the physical activity and nutritional environments for youth and their families.