Barbara Rolls, Ph.D., is professor of nutritional sciences and the Helen A. Guthrie Chair of Nutritional Sciences at Pennsylvania State University, where she heads the Laboratory for the Study of Human Ingestive Behavior. A veteran nutrition researcher and past president of both the Society for the Study of Ingestive Behavior and the Obesity Society, Dr. Rolls has been honored throughout her career with numerous awards, including Fellow of the American Association for the Advancement of Science and honorary membership in the American Dietetic Association. In 2010 she received the Obesity Society's highest honor, the George A. Bray Founders Award, and was elected to the American Society for Nutrition's Fellows Class of 2011. She is the author of more than 250 research articles and six books, including The Volumetrics Weight Control Plan and The Volumetrics Eating Plan. She lives in State College, Pennsylvania.Mindy Hermann, R.D., is a writer who specializes in collaborative projects on cooking, food, and nutrition with researchers, health professionals, and chefs. The Ultimate Volumetrics Diet is her tenth book. She lives in Mount Kisco, New York.