- 2002/04 - 現在 School of Asia 21, Kokushikan University Visiting Professor
- 2009/04 - 2023/03 Tokyo University of Foreign Studies Institute of Global Studies Professor
- 2006/04 - 2009/03 Tokyo University of Foreign Studies Faculty Foreign Studies Professor
- 2008/05 - 2008/06 University for Peace Visiting Professor
- 2002/04 - 2006/03 Graduate School of Social Design Studies, Rikkyo University Professor
- 2003/02 - 2004/04 Ministry of Foreign Affairs, Japan Special Representative of Japanese Government for DDR in Afghanistan
- 2001/06 - 2002/03 United Nations Chief, DDR Coordination Section, United Nations Mission in Sierra Leone (UNAMSIL)
- 2000/03 - 2001/06 United Nations District Administrator Suai/Cova Lima, United Nations Transitional Administration in East Timor (UNTAET)
- 1998/09 - 2000/02 National Graduate Institute for Policy Studies Lecturer
- 1998/01 - 2000/02 Sasakawa Peace Foundation Chief Researcher
- 1997/03 - 1998/09 Plan International Japan Director, International Program
- 1994/07 - 1997/02 Plan International Country Director Ethiopia
- 1992/04 - 1994/06 Plan International Field Director Kenya
- 1988/01 - 1992/03 Plan International Field Director Sierra Leone
- 1990/07 - 1991/06 City Council, Makeni, Sierra Leone Councilor
- 1985/01 - 1987/06 Asian Commitee for Peoples Organization Program Coordinator India Bombay
- 1984/01 - 1984/12 Slum Rehabilitation Society, Bombay, India Consultant Planner
- 1983/04 - 1983/07 Ahmedabad Study Action Group, Ahmedabad, India Consultant Planner