- 2023/04 - 2023/09 National Maritime Research Institute; National Institute of Maritime, Port and Aviation Technology Senior director for research
- 2020/04 - 2023/03 National Maritime Research Institute; National Institute of Maritime, Port and Aviation Technology Managing director for research affairs
- 2007/04 - 2023/03 Tokyo University of Marine Science and Technology Visiting professor
- 2016/04 - 2020/05 National Maritime Research Institute (NMRI); National Institute of Maritime, Port and Aviation Technology Fluids Engineering & Ship Performance Evaluation Department Head, Marine Dynamics Research Group
- 2020/01 - 2020/03 National Maritime Research Institute (NMRI); National Institute of Maritime, Port and Aviation Technology Senior director for research
- 2019/01 - 2019/12 National Maritime Research Institute (NMRI), National Institute of Maritime, Port and Aviation Technology Fluids Engineering & Ship Performance Evaluation Department Director, Fluids Engineering & Ship Performance Evaluation Department
- 2015/04 - 2016/03 National Maritime Research Institute (NMRI) Fluids Engineering & Ship Performance Evaluation Department Head, Marine Dynamics Research Group
- 2009/08 - 2015/03 NMRI Fluids Engineering & Ship Performance Evaluation Department Head, Marine Dynamics Research Group
- 2006/04 - 2009/08 NMRI Fluids Department Head, Marine Dynamics Research Group
- 2005/04 - 2007/03 Osaka Prefecture University Visiting professor
- 2004/04 - 2006/03 NMRI Advance Transportation Department Head, Manoeuvring and Control Group
- 2002/04 - 2004/03 NMRI Maritime Safety Department Head, Manoeuvring and Control Group
- 2001/04 - 2002/03 National Maritime Research Institute (NMRI) Ship Dynamics Division Senior researcher
- 1995/12 - 2001/03 SRI, MOT Ship Dynamics Division Senior researcher (Reseat.)
- 1994/12 - 1995/11 Technology and Safety Division, MOT (Loan) Special assistant
- 1994/09 - 1994/11 SRI, MOT Ship Dynamics Division Senior researcher (Reseat.)
- 1993/09 - 1994/08 California Institute of Technology, USA Visiting associate
- 1992/04 - 1993/08 SRI, MOT Ship Dynamics Division Senior researcher
- 1984/04 - 1992/03 Ship Research Institute (SRI), Ministry of Transport (MOT) Ship Dynamics Division Researcher