Jennifer Ashton, M.D., M.S., the chief medical correspondent for ABC News, including Good Morning America, World News Tonight with David Muir, Nightline, and GMA3: What You Need to Know. A graduate of Columbia University’s medical school, Dr. Ashton is board certified in OB-GYN and obesity medicine, and maintains a private clinical practice in New Jersey. She lives in New York City with her two children.