Hiroshi Tanimoto is a Head of Global Atmospheric Chemistry Section at National Institute for Environmental Studies (NIES) in Tsukuba, Japan. He also serves as a project leader for the NIES’s “East Asian Environment Program”. He received his PhD in Chemistry from The University of Tokyo in 2001 and was a visiting scholar at Harvard University during 2007–2008. Dr. Tanimoto has been working in the field of atmospheric composition in Asia and Oceania regions. Over the past years, his group has developed novel instruments, made field measurements at surface stations and ships, and analyzed the data with extensive use of chemistry-transport models and satellite observations to investigate atmospheric chemistry and its impacts on global change. In particular he has been studying tropospheric ozone issues and their long-term trends in East Asia, contributions from anthropogenic/biomass burning emissions, and long-range transport of ozone and its precursors. He recently extended his research to air-sea interaction/biogeochemistry, in close collaboration with chemical and biological oceanographers. He has authored or co-authored more than 70 publications in peer-reviewed scientific journals on these topics, resulting in several Young Scientist Awards. Dr. Tanimoto is active in providing international contributions. He is a co-author of Task Force on Hemispheric Transport on Air Pollution (TF HTAP) 2010 Assessment Report, an associate editor of Geochemical Journal, a planning group member/co-chair at JSPS/AvH’s Japanese-German Frontiers of Science Symposium, and a co-chief scientist for gas chemistry intercomparison at the ABC-Asia campaign in 2005. He currently serves as the IGAC representative of the joint IGBP-WCRP-DIVERSITAS subcommittee of the Science Council of Japan and is a member of the committee for Japanese air quality satellite missions.