Bent Sørensen is professor emeritus 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), Niels Bohr Institute at Copenhagen University (Denmark) and University of New South Wales (Australia). He has served as advisor for the OECD, the Japanese and Australian governments, and various UN agencies, as technical director and board member of Novator and Cowi Inc., and as lead author for the IPCC working group on climate change mitigation. He served as chairman of the Danish Energy Agency Solar Energy Committee and the Hydrogen Energy Committee, and received prizes such as the Australian-European Award for Eminent Scholars (1982) and the European Solar Prize (2002). In 1989, he was knighted by HRH Queen Margrethe of Denmark. He is the author of some 25 books and nearly 1000 articles, most of which in peer-reviewed journals, and covering a cross-disciplinary range of fields, from physics, mathematics and engineering to economy, environmental science, philosophy, political science, history and archaeology.