Professor Emeritus at the Department of People and Technology, and a professor of physics at the Institute of Mathematics and Physics, both at Roskilde University, Denmark. He is also an independent consultant at Novator Advanced Technology Consulting. Bent Sorensen's research is cross-disciplinary and has resulted in nearly a thousand scientific articles and some 30 books, including foundation work in economic theory (the scenario method, life-cycle analysis) and in energy research (renewable energy resources, technology and applications). Dr. Sorensen is one of the world's leading specialists in renewable energy. He has five decades of experience in researching the field, and has published hundreds of monographs, articles in scientific journals, technical reports, and conference contributions. He has received several awards and has been knighted by Her Majesty Queen Margrethe of Denmark. He has worked at universities in Japan, France, Denmark, Australia and the United States (Berkeley and Yale), has been a consultant to governments and international organizations, a lead author in the IPCC climate assessment. Paul Breeze is a journalist and freelance Science and Technology writer and consultant in the UK who has specialized 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 aspects of power generation, transmission, and distribution. Dr. da Rosa taught the perennially popular Renewable Energy course at Stanford University for over 30 years. Former Chairman of the Brazilian National Research Council, Director of the Aeronautical Technical Center, and founder of Brazilian NASA, he also served as the CEO of a tech start-up, Chairman of the Board for a microprocessor manufacturer, and as a member of Siemens Corporation's scientific advisory board. 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. Professor Kalogirou obtained his PhD and DSc from the University of Glamorgan, UK. For 30 yearshe has been actively involved in research of solar energy and in flat plate and concentrating collectors, solar water heating, solar steam generating systems, desalination and absorption cooling in particular. He has many books and book contributions and has published large number papers in international scientific journals and refereed conference proceedings. He is Editor-in-Chief of Renewable Energy and Deputy Editor-in-Chief of Energy, as well as Editorial Board Member of another eleven journals. He is the author of the book Solar Energy Engineering: Processes and Systems, published by Academic Press of Elsevier. He has been a member of World Renewable Energy Network (WREN), American Society of Heating Refrigeration and Air-conditioning Engineers (ASHRAE), Institute of Refrigeration (IoR) and International Solar Energy Society (ISES).