Hiroshi Tanimoto is the Head of Global Atmospheric Chemistry Section at National Institute for Environmental Studies (NIES) in Tsukuba, Japan. 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 on 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, including long-term ozone 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 and ocean biogeochemistry. He currently serves as the co-chair of the International Global Atmospheric Chemistry (IGAC) project, as well as the chair of IGAC-Japan National Committee and the co-chair of IGAC-MANGO.