C. Yan Cheng Ph.D. is a senior scientist at the Population Council’s Center for Biomedical Research, New York, affiliated with the Council's Reproductive Health program, where his research focuses on developing new male contraceptive methods through a better understanding of male fertility and infertility, and on the biology of the blood-testis barrier and the mechanism by which environmental toxicants induce testicular injury. He serves as an ad-hoc reviewer of grant proposals submitted to the National Institutes of Health’s Cellular, Molecular and Integrative Reproduction Study Section and the Endocrinology, Metabolism, Nutrition and Reproductive Sciences Study Section. He holds a Ph.D. in biochemistry and cell biology from the University of Newcastle, New South Wales, Australia, after an undergraduate degree from the Chinese University of Hong Kong. His research has been supported by the National Institute of Child Health and Human Development, National Institutes of Health, for the last three decades. He has published more than 400 peer-reviewed papers. He was awarded the Richard E. Weizman Memorial Award from the Endocrine Society in 1988 and received the Best Scientific Paper Award from the American Society of Andrology in 1997. He also served as the Editor-in-Chief of the peer-review journal Spermatogenesis from 2011 through 2016.