Safa Kasap is currently a Distinguished Professor of Electronic and Optoelectronic Materials and Devices in the Electrical Engineering Department at the University of Saskatchewan, Canada. He obtained his B.Sc. (1976), M.Sc. (1978) and Ph.D. (1983) degrees from the Imperial College of Science, Technology and Medicine, University of London, UK, specializing in amorphous semiconductors and chalcogenide glasses. In 1996 he was awarded the D.Sc. (Engineering) from London University for his research contributions to materials science in electrical engineering. He is a Fellow of the American Physical Society and the Royal Society of Canada. He is the author of Optoelectronics and Photonics: Principles and Practices (2nd Edition) and Principles of Electronic Materials and Devices (4th Edition). Both textbooks are widely used by many major universities and professionals. He is the Deputy Editor in Chief for the Journal of Materials Science: Materials in Electronics. Peter Capper was formerly Materials Team Leader at SELEX ES, which is now part of Leonardo-Finmeccanica. Dr. Capper obtained his B.A. (1968) and Ph.D. (1971) in Chemical Physics and Physics from Essex University and Portsmouth Polytechnic, UK, respectively. He has spent some 40 years in the infrared industry growing and characterizing cadmium mercury telluride (CMT) and other tellurium-based materials. He holds patents in the bulk growth of CMT, has authored/co-authored over 100 papers and given several invited talks at international crystal growth/infrared (IR) conferences. He is a Fellow of the Institute of Physics and an Editor for the Journal of Materials Science: Materials in Electronics. He has edited/co-edited 10 books in IR materials and devices and crystal growth.