James R. Couper, D.Sc. is Professor Emeritus, Dept. of Chemical Engineering, Unviersity of Arkansas, Fayetteville, AR.W. Roy Penney, Ph.D., Professor Emeritus, Dept. of Chemical Engineering, University of Arkansas, Fayetteville, AR, has taught graduate courses in Fluid Mixing for the last 25 years and he taught the AIChE "Industrial Fluid Mixing course for 15 years. He spent 25 years in industry where he was involved in experimental and design work involving fluid mixing equipment. For the last 30 years he has had an academic career where he taught and researched fluid mixing technology. He consulted in the area of fluid mixing for several companies, including Chemineer, Dow Corning, Conoco, Unique Tire, Energy Transfer Partners et al. Dr. Penney is author or coauthor of over 60 papers, Patents and lectures and three books. He is a Fellow of the American Institute of Chemical Engineers. He has registration as a Professional Engineer in Missouri and Arkansas.