Ruopeng An conducts research to assess environmental influences and population-level interventions on weight-related behaviors and outcomes throughout the life course. In particular, An examines socioeconomic determinants and policies that impact dietary behavior, physical activity, and adiposity in children, adults of all ages, and people with disability. The goal of An’s research is to develop a well-rounded knowledge base and policy recommendations under the social-ecological framework that can inform decision-making and social resource allocation in obesity prevention, health disparity reduction, and improvement in people’s quality of life. An has published articles in the American Journal of Preventive Medicine, Obesity Reviews, Social Science & Medicine, and Pediatric Obesity. His research has been widely featured in media, including Time, the New York Times, Los Angeles Times, and on CNN.