ROBERT L. EVANS is Professor Emeritus of Mechanical Engineering at The University of British Columbia (UBC) in Vancouver, Canada. He obtained a B.A.Sc. degree in mechanical engineering from UBC, an M.A.Sc. from the University of Toronto and a Ph.D. from Cambridge University. Dr. Evans served as Head of the Department of Mechanical Engineering, and was founding Director of the Clean Energy Research Centre at UBC. Dr. Evans is also the author of Fueling Our Future: An Introduction to Sustainable Energy, published by Cambridge University Press. The book was short-listed for the 2007 Donner Prize for the best book on public policy published by a Canadian author. The author met Sir Frank Whittle on 25 May 1973, when the latter came to open the new Whittle Laboratory at Cambridge University where Evans was a post-graduate student. Whittle gave a brief but fascinating talk about his invention of the jet engine; many years later this book is the result of that meeting.