Professor Reay manages David Reay & Associates, UK, and he is a Visiting Professor at Northumbria University, Emeritus Professor at Newcastle University, and Honorary Professor Brunel University London, UK. His main research interests are compact heat exchangers, process intensification, and heat pumps. He is also Editor-in-Chief of Thermal Science and Engineering Progress and Associate Editor of the International Journal of Thermofluids, both are published by Elsevier. Prof. Reay is the Author/Co-author of eight other books.Colin Ramshaw conceived and developed the concept of Process Intensification in the 1980's while working for ICI. He pioneered further aspects of PI after being appointed to the Chair of Chemical Engineering at Newcastle University. He is now a Visiting Professor at Cranfield University