- 2024/04 - 現在 Tokyo Rosai Hospital, Japan Organization of Occupational Health and Safety Managing department Director General
- 2023/04 - 2024/03 Teraoka Memorial Hospital Geriatric Health Care Center Director
- 2013/01 - 2023/03 Nippon Medical School Department of Neurological Surgery Professor & Chairman
- 2006/04 - 2012/12 NTT Medical Center Tokyo Neurosurgery Director
- 2001/02 - 2006/03 Associate Professor, Department of Neurosurgery, University of Tokyo
- 1998 - 2001 Assistant Professor , Department of Neurosurgery
- 1997 - 1998 Assistant Professor Department of Neurosurgery, George Washington University
- 1997 - 1998 ジョージワシントン大学脳神経外科 講師
- 1989 - 1996 メイヨークリニック脳神経外科フェローレジデント
- 1989 - 1996 Department of Neurosurgery, Mayo Clinic
- 1982 - 1989 東京大学脳神経外科
- Nippon Medical School Graduate School, Department of Neurosurgery Graduate School Professor
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