Joanne Stone, MD, is a full-time faculty member in the internationally renowned Division of Maternal-Fetal Medicine at The Mount Sinai Medical Center in New York City. She is the director of the Division of Maternal-Fetal Medicine and also cares for patients with problem pregnancies. She has lectured throughout the country, is widely published in medical journals, and has been interviewed frequently for television and magazines on topics related to pregnancy, with a special emphasis on the management of multi-fetal pregnancies. She was a co-star in the critically acclaimed series Pregnancy For Dummies on the Discovery Health Channel. Away from the hospital she loves to spend time with her husband, George, and her two wonderful girls, Chloe and Sabrina. Keith Eddleman, MD, works with Joanne at Mount Sinai. He is a professor in the medical school and the Director of Obstetrics at the hospital. He teaches medical students, residents, and fellows; lectures throughout the world; and appears often on television to discuss issues concerning the care of pregnant women. His areas of special expertise are ultrasound and reproductive genetics. He was also a co-star on the critically acclaimed series Pregnancy For Dummies on the Discovery Health Channel. His free time, when he has any, is split between spending time with his family at their apartment in Manhattan or at their country house in upstate New York. Mary Duenwald is a writer and editor who has specialized in medicine and science journalism for many years. She has written for the New York Times, Discover, Smithsonian, and Departures. She has been executive editor of Harper?s Bazaar, Women?s Sports & Fitness, and The Sciences magazines and a senior editor for Vogue. She is currently a contributing editor for GQ. She is also the mother of twins, Nick and Claire Murray.