Dr. Mendoza has devoted his career to studying the promotion of physical activity and healthy eating among low-income and racial/ethnic minority children. He conducts community-engaged research on eliminating health inequities by reducing screen time, such as television viewing, and increasing physical activity, such as through Safe Routes to School programs. He leads research on the influence of food insecurity on chronic diseases, such as diabetes, among adolescents and young adults. He also co-leads mHealth interventions to promote physical activity among AYA cancer survivors.