- 2020/04 - 2025/03 Tokyo Metropolitan University Department of Applied Chemistry for Environment Professor
- 2018/04 - 2020/03 Tokyo Metropolitan University, Tokyo Japan Department of Applied Chemistry, Graduate School of Urban Environmental Sciences Professor
- 2010/04 - 2018/03 Tokyo Metropolitan University, Tokyo Japan Department of Mechanical Engineering, Graduate School of Science and Engineering Professor
- 2009/04 - 2010/03 National Traffic Safety and Environment Laboratory, Ministry of Land, Infrastructure, Transport and Tourism of Japan, Tokyo Japan Environment Research Department Visiting Researcher
- 2005/04 - 2010/03 Hokkaido University, Sapporo Japan Division of Energy and Environmental Systems, Graduate School of Engineering Associate Professor
- 2004/03 - 2005/03 Kitami Institute of Technology, Kitami Japan Hydrogen Energy Research Laboratory, Department of Mechanical Engineering Professor
- 2002/04 - 2004/03 Musashi Institute of Technology, Tokyo Japan Hydrogen Energy Research Center, Department of Environmental Energy Engineering Associate Professor
- 2003/04 - 2004/01 Massachusetts Institute of Technology, Cambridge MA USA Sloan Automotive Laboratory, Laboratory for Energy and Environment Visiting Scientist
- 1997/10 - 2002/03 Musashi Institute of Technology, Tokyo Japan Hydrogen Energy Research Center, Department of Energy Science and Engineering Assistant Professor
- 2000/05 - 2000/09 Tsinghua University, Beijing China State Key Laboratory of Automotive Safety and Energy Conservation Advanced Visiting Scholar
- 1995/04 - 1997/09 Mitsubishi Motors Co. Ltd., Aichi Japan Engine Research Division, Research & Development Center Fundamental Research Group
- 1993/04 - 1995/02 Hokkaido Institute of Technology, Sapporo Japan Department of Mechanical Engineering Lecturer