M. R. Riazi is a Professor and the Chair of Chemical and Natural Gas Engineering at Texas A&M University–Kingsville. He received his academic degrees from Penn State University and held many academic and industry positions worldwide. He has published widely, including 9 books mainly in the areas of energy and environment and is the founding editor of IJOGCT as well as the Chair of Fuels & Petrochemicals Division (FPD) at the AIChE Annual Meetings. He received a Diploma of Honor from National (American) Petroleum Engineering Society for outstanding services to the petroleum industry and is a Fellow of AIChE as well as a licensed professional engineer in Ontario, Canada (www.riazim.com). H. W. Yarranton is a Professor of Chemical and Petroleum Engineering at the University of Calgary. He received his academic degrees from the University of Alberta and has held reservoir and production engineering positions in the oil industry. His research is focused on the phase behavior and properties of heavy oils and solvents, the fundamentals of water-in-oil emulsions, and oil sands extraction and froth treatment. He has been an SPE Distinguished Lecturer and was awarded the SPE Regional Distinguished Achievement Award for Petroleum Engineering Faculty.