D. Yogi Goswami is a distinguished university professor and director of the Clean Energy Research Center at the University of South Florida. He conducts fundamental and applied research on solar thermal power and cooling, photocatalytic detoxification and disinfection, thermodynamics, third-generation photovoltaics, and hydrogen production and storage. Professor Goswami is the editor in chief of Solar Energy and Progress in Solar Energy. He has published as an author or editor 19 books and more than 375 refereed technical papers. He also holds 17 patents, some of which have been successfully commercialized. Frank Kreith is professor emeritus of engineering at the University of Colorado, Boulder, USA. He received his MS in engineering from the University of California, Los Angeles, USA and his doctorate from the University of Paris in 1964. From 1953 to 1959, he was associate professor of mechanical engineering at Lehigh University, Bethlehem, Pennsylvania, USA. In 1959, he joined the University of Colorado, where he held appointments as professor of mechanical and chemical engineering. He was senior research fellow at the Solar Energy Research Institute, and has consulted for NATO, the U.S. Agency of International Development, and the United Nations.