Yuri S. Muzychka, PhD, is a Professor of Mechanical Engineering at Memorial University of Newfoundland (Canada) and a Fellow of ASME, CSME, and the Engineering Institute of Canada, and Associate Fellow of AIAA. He has published over 250 peer reviewed journal and conference papers, 3 handbook chapters, and 2 books including Thermal Spreading and Contact Resistance. M. Michael Yovanovich, ScD, is a Distinguished Professor Emeritus at the University of Waterloo (Canada) and a Fellow of ASME, AIAA, and AAAS. He has delivered over 150 keynote lectures and published over 350 peer reviewed journal and conference papers, 4 handbook chapters, and 2 books including Thermal Spreading and Contact Resistance.