Soylent 1.2 was developed under the close guidance of our nutritional advisor, Dr. F. Xavier Pi-Sunyer, M.D., MPH. Pi-Sunyer is professor of medicine at Columbia University College of Physicians and Surgeons in New York City. At St. Luke’s-Roosevelt Hospital Center he serves as chief of endocrinology, diabetes, and nutrition, and is director of the New York Obesity Research Center. Dr. Pi-Sunyer is also a senior attending physician at St. Luke’s-Roosevelt Hospital and New York-Presbyterian Hospital.