Ronald Wapner, MD is a Professor of Obstetrics and Gynecology for Columbia University Irving Medical Center and the Director of Reproductive Genetics. Dr. Wapner is an internationally known physician and researcher specializing in reproductive genetics. He pioneered the development of chorionic villus sampling (CVS) and multi-fetal reduction. He has authored or co-authored over 400 publications and he has been an active investigator in the area of Maternal-Fetal Medicine. He is either a principal or co-investigator for several NICHD-sponsored multi-center studies.