Dr. William H. Walker received his B.S. degree in Biology from the University of North Carolina at Chapel Hill and his Ph.D. in Biochemistry and Molecular Biology from the University of Texas Health Science Center in Houston. He obtained his postdoctoral training under the direction of Warner C. Greene at Duke University and Joel F. Habener at Massachusetts General Hospital, Harvard School of Medicine. He is an Associate Professor in the Department of Obstetrics and Gynecology and the Magee-Womens Research Institute at the University of Pittsburgh. His research is focused on the endocrine control of male spermatogenesis and fertility.