Bent Sørensen is professor emeritus in physics at Roskilde University, Denmark). He has held academic positions at University of California in Berkeley, Yale University, The National Renewable Energy Laboratory in Golden (US), Kyoto University (Japan), University of Grenoble (France) and University of New South Wales (Australia) and served as advisor for the OECD, the Japanese and Australian governments, and various UN agencies, including as lead author the IPCC working group on climate change mitigation. He has published nearly 1000 scientific articles and many books, including two volumes on hydrogen and fuel cells. He served as chairman of the Danish Energy Agency's Solar Energy and Hydrogen Energy Committees, and received prizes such as the Australian-European Award for Eminent Scholars (1982) and the European Solar Prize (2002).Dr. Maegaard is Director of the Nordic Folkecenter for Renewable Energy, an institute for the development and implementation of renewable energies located in Denmark. The center has, under his leadership, provided transfer of renewable energy technology to many countries. Dr. Maegaard was appointed the first president of the World Wind Energy Institute, first president of the World Wind Energy Association, and has served as a Renewable Energy Adviser to the President of Mali. For over three decades, Dr. Maegaard has been a director, organizer, and speaker at numerous international seminars, workshops and conferences. He has authored numerous reports, books, and articles in Danish, English, German and Japanese on renewables and sustainable development.Prof. Soteris Kalogirou is a Professor in theDepartment of Mechanical Engineeringand Materials Science and Engineering atthe Cyprus University of Technology. Inaddition to his Ph.D., he holds a D.Sc. and isinternationally recognized for his pioneeringcontributions to renewable energy. He is aFellow of the European Academy of Sciences,a Founding Member of the Cyprus Academyof Sciences, Letters and Arts, a Member ofAcademia Europaea, and a Fellow of theInternational Artificial Intelligence IndustryAlliance. For over 35 years, he has conductedresearch in solar energy, with expertiseencompassing solar collectors, solar waterheating, solar steam generation, desalination, photovoltaics, geothermal energy, andabsorption cooling. He has published extensively,authoring numerous journal articles,book chapters, and conference papers. Hisbooks Solar Energy Engineering: Processes andSystems and Thermal Solar Desalination: Methods and Systems (Academic Press, Elsevier)are widely recognized references in the field.He currently serves as Editor-in-Chief ofRenewable and Sustainable Energy Reviews.Paul Breeze is a journalist and freelance science and technology writer and consultant in the United Kingdom. He has specialised in power generation technology for the past 30 years. In addition to writing Power Generation Technologies, Second Edition, he has contributed to journals and newspapers such as The Financial Times and The Economist and has written a range of technical management reports covering all the aspects of power generation, transmission and distribution.Galen J. Suppes is a professor at the Department of Chemical Engineering of the University of Missouri, Columbia, USA. He received his B.S in Chemical Engineering from Kansas State University in 1985, and his Ph.D. from The Johns Hopkins University in 1989. He has also done Post-Doc Class Work at the University of Huston in 1991/92, and is author of over 120 documents, including peer reviewed articles, conference papers and scientific reports.