Her work has investigated the effects of lead on crime, childhood behavior problems, antisocial behavior, and educational outcomes. Her research has been published in economics journals and featured in a variety of publications and news outlets throughout the world. Reyes is particularly interested in areas of health and inequality, and her broader research agenda focuses on public health and social impacts of environmental pollution. She is also a faculty research fellow with the National Bureau of Economic Research and recently served as a visiting scholar with the New England Public Policy Center at the Federal Reserve Bank of Boston.