Prof. Taikan Oki received his Ph.D in Civil Engineering at The University of Tokyo in 1993. He is the Professor at Department of Human and Social Systems, Institute of Industrial Science, The University of Tokyo, and leading the research group for Hydrology and Water Resources Engineering. He stayed as a Visiting Scientist at NASA/GSFC, USA 1995-97, and he has also worked as an Associate Professor at the Research Institute for Humanity and Nature in Kyoto, Japan, 2001-03. He also assigned at the Council for Science and Technology Policy, Cabinet Office of Japan as a Deputy Director for Environment and Energy from January 2005 through December 2006, to support policy making, prioritization and evaluation of measures of science and technology in Japan. He served as a lead author for the WGII/Chapter 3 “Freshwater resources and their management” of the IPCC Fourth Assessment Report as well as a contributing author for the UN-Millennium Ecosystem Assessment. He got awarded the Japan Academy Medal from The Japan Academy in 2008. His research interests within the field of atmospheric hydrology and global water resources engineering including world water resources assessment and the virtual water trade, impacts of climate change on hydrological extremes and water resources managements.