1993, PhD in Civil Engineering, University of Tokyo. 1995-97, Visiting Scientist, NASA-GSFC, US; 2005-06, Deputy Director for Environment and Energy, Council for Science and Technology Policy, Cabinet Office of Japan, to support policy making, prioritization and evaluation of measures of science and technology in Japan. One of lead authors for the WGII Chapter 3 Freshwater Resources and their Management, IPCC Fourth Assessment Report. Recipient of awards including: Japan Academy Medal; JSPS Award. Research interests: atmospheric hydrology and global water resources engineering including world water resources assessment and virtual water trade, impacts of climate change on hydrological extremes, water resources managements in Asian monsoon region.