Dr. Hans-Holger Rogner received his Masters of Science and Doctorate in 1981 from the University of Karlsruhe, Germany in energy economics and applied systems analysis. His early research at the International Institute for Applied Systems Analysis (IIASA) in Laxenburg, Austria concentrated on technology change and energy system modeling. From 1990-1997 he directed the System Analysis Group at the Institute for Integrated Energy Systems, University of Victoria. In 1997 Dr. Rogner joined the IAEA. His current focus is on sustainable energy development of different energy supply and demand option and capacity building in energy-environmental planning. He has contributed to two parliamentary inquiry commissions of the German Bundestag on atmospheric protection, served several times as a lead author for the Intergovernmental Panel on Climate Change, collaborated on major global energy analyses (including the IIASA-World Energy Council (WEC) "Global Energy Perspectives"), and served as a Convening Lead Author for the World Energy Assessment, a joint effort of the United Nations Development Programme, the UN Department of Economic and Social Affairs and WEC.