Charles I. Onwulata, Ph.D. is a Research Food Technologist with the USDA-Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA. He serves as a Lead Scientist in the Dairy Processing and Products Research Unit and heads the Center of Excellence in Extrusion and Polymer Rheology (CEEPR). Peter J. Huth, Ph.D. is a consultant in nutrition research and scientific affairs, Chicago, IL. Previously, he served as Director, Nutrition Research and Scientific Affairs for Dairy Management Inc., Rosemont, IL.