Professor Stewart is recognized as one of the world’s leading scholars in environmental and administrative law. Prior to joining the faculty, Stewart served as Byrne Professor of Administrative Law at Harvard Law School and as a member of the faculty of the Kennedy School of Government at Harvard. He has served as assistant attorney general in charge of the Environment and Natural Resources Division of the US Department of Justice and chairman of the Environmental Defense Fund. Professor Stewart founded the Guarini Center in 1993 and served as Faculty Director of the Center until his passing in 2023.