Professor of the Physics of the Ocean and Atmosphere and Director of the Institutes of Environmental Physics and Remote Sensing at the University of Bremen. A fellow of the Centre for Ecology and Hydrology (CEH), part of the Natural Environment Research Council (NERC)

Senior Scientist, National Center for Atmospheric Research (NCAR), USA New: Pacific Northwest National Laboratory, USA (from Nov. 8^th,2022)

Professor, Geophysical Institute, University of Bergen (UiB), Norway

Professor Emeritus, Institute for Catastrophic Loss Reduction at Western University’s Department of Geography.

Professor, Research Center for Advanced Science and Technology,The University of Tokyo, Japan

Distinguished professor, Distinguished Chair in Atmospheric Chemistry, Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, USA

Distinguished Professor, Department of Marine Sciences, Texas A&M University, USA

Dusenbury Professor of Geological and Geophysical Sciences at Princeton University, USA

Akira Yamaguchi Professor of Environmental Health and Human Habitation, Dept. of Environmental Health, School of Public Health, Harvard University, USA

Professor/ Department of Ocean Technology, Policy and Environment Graduate School, The University of Tokyo, Japan

Professor/ Director of the Institute for Energy and Climate Research IEK-8: Troposphere

Independent Scholar/ retired, maintain relationship with Hiroshima University as Senior Advisor to VP for Global Cooperation and Outreach.