She is a faculty member in the Departments of Environmental Health Sciences and Epidemiology at the Johns Hopkins Bloomberg School of Public Health. Her research investigates the long-term health effects of environmental chemicals, including arsenic, their interactions with genetic and epigenetic variants, and effective interventions for reducing the health effects of widespread environmental exposures. She is the principal investigator of the Strong Heart Metal Study, one of the major population based-studies investigating the long-term consequences of low-to-moderate exposure to arsenic.