Nathan is a professor of Obstetrics and Gynecology and Maternal Fetal Medicine at the Mount Sinai School of Medicine in New York City. He has a busy clinical practice of high-risk obstetrics, regularly publishes his peer-reviewed clinical research, and is invited to lecture nationally and internationally on pregnancy-related topics. He is also the co-author of The Unexpected: Navigating Pregnancy During and After Complications and host of the Healthful Woman Podcast. He has four children.