Daniel A. Dumesic, MD is Professor and Division Head of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, University of California, Los Angeles, Los Angeles, CA. He also is Affiliated Scientist, National Primate Research Center, University of Wisconsin, where he has collaborated in several human and nonhuman primate studies regarding mechanistic and clinical aspects of PCOS. Dr. Dumesic is a member of several international societies, including the American Society of Reproductive Medicine and the Endocrine Society, and is Past President of the Androgen Excess-PCOS Society. He has received the prestigious Mayo Award for Excellence in Leadership and has authored more than 100 publications in reproductive endocrinology.