John S. Ji is an Associate Professor at Tsinghua University Vanke School of Public Health. His research interest is in aging and environmental health. Previously, he was an Assistant Professor of Environmental Health Science at Duke Kunshan University, and held a secondary appointment in the Division of Environmental Science & Policy at Duke Nicholas School of the Environment. He also was the Associate Director for the international Masters of Environmental Policy (iMEP) program at DKU. He received his bachelor’s degree in Neuroscience from Johns Hopkins University and his doctoral degree in Environmental Health from Harvard School of Public Health.