- 2004/04 - 現在 Professor, Department of Digestive Surgery, Nihon University School of Medicine
- 2004/04 - Professor, Department of Digestive Surgery, Nihon University School of Medicine
- 2001/04 - 2004/03 Professor, Third Department of Surgery, Nihon University School of Medicine
- 1997/04 - 2001/03 Assistant professor, Department of Surgery, Divisions of Hepato-Biliary-Pancreatic Surgery, Graduate School of Medicine University of Tokyo
- 1996/11 - 1997/03 Assistant professor, Second Department of Surgery, School of Medicine University of Tokyo
- 1995/10 - 1996/10 Instructor, Second Department of Surgery, School of Medicine University of Tokyo
- 1995/04 - 1995/09 Head surgeon, Department of Surgery, National Cancer Center Hospital
- 1989/06 - 1995/03 Staff surgeon, Department of Surgery, National Cancer Center Hospital
- 1987/06 - 1989/05 Chief resident, Department of Surgery, National Cancer Center Hospital
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