- 2008 - 現在 Teikyo University School of Medicine, Department of Neurosurgery Associate Professor
- 2004 - 2008 Teikyo University School of Medicine, Department of Neurosurgery Assistant Professor
- 2002 - 2004 University of California, San Diego School of Medicine Assistant Professor
- 1999 - 2002 Tokyo Metropolitan Police Hospital Department of Neurosurgery Senior Medical Staff
- 1998 - 1999 National Space Development Agency of Japan Project Scientist
- 1996 - 1998 NASA Ames Research Center Senior Research Associate
- 1995 - 1996 Tokyo Metropolitan Police Hospital Department of Neurosurgery Medical Staff
- 1990 - 1995 Tokyo Metropolitan Police Hospital Department of Neursurgery Resident
- 1989/06 - 1989/12 University of Tokyo Hosipital Department of Neurosurgery Resident
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