Tongzhang Zheng is a Professor of Epidemiology in the Brown School of Public Health. Before coming to Brown he was the Susan Dwight Bliss Professor of Epidemiology, and the Chairman of the Department of Environmental Health Sciences at Yale School of Public Health. Dr. Zheng earned a Sc.D. in epidemiology from Harvard University, with minors in environmental health sciences and biostatistics, and a medical degree from the Tongji Medical School, Huazhong University of Science and Technology. Zheng has been conducting epidemiological research as Principal Investigators in the areas of cancer epidemiology and environmental epidemiology investigating the relationship between environmental exposures, genetic polymorphisms, epigenetic factors and gene-environment interaction in the risk of various cancers in the US and in China, including breast cancer; non-Hodgkin’s lymphoma, Hodgkin’s disease, multiple myeloma, liver cancer, thyroid cancer, lung cancer and testis cancer. Dr. Zheng has authored or co-authored over 380 articles/book chapters and co-edited the textbook, Epidemiology and Biostatistics. He has been leading two Fogarty training programs in China training and conducting collaborated epidemiological studies in China. He is currently building three large cohort studies in China (including Jingchuan Metal Exposure Cohort Study; A Cohort Study in Kailuan Coal Industry; and A Prenatal and Birth Cohort Study of Prenatal Exposure and Children's Health) by collaborating with the scientists from China National Cancer Center, China National Institute of Environmental Health Sciences, and several universities in China, He has served as Senior Advisors and several committees for the National Academy of Sciences and the International Agency for Research on Cancer (WHO).