R.E. Hayes is a professor of chemical engineering in the Department of Chemical and Materials Engineering at the University of Alberta in Edmonton, Canada. He received a Ph.D. in chemical engineering at the University of Bath, UK. He is the author or coauthor of numerous research articles in the area of reaction engineering and is a coauthor of the book Introduction to Catalytic Combustion. He is a Fellow of the Canadian Society of Chemical Engineering and a registered professional engineer with the Association of Professional Engineers, Geologists, and Geophysicists of Alberta.

J.P. Mmbaga is a senior research associate in the Department of Chemical and Materials Engineering at the University of Alberta in Edmonton, Canada. He obtained his doctorate in chemical engineering from the University of British Columbia, Canada. He has spent more than 25 years in teaching, research, and process consulting in oil and gas processing, energy, and other chemical process industries in Alberta and Tanzania. He has authored and coauthored a number of technical publications and is a member of the Canadian Society of Chemical Engineering and the Association of Professional Engineers, Geologists, and Geophysicists of Alberta.