- 2024/04 - 現在 Nagasaki University Inter-faculty nitiative for Planetary Health Associate Dean
- 2020/04 - 現在 Nagasaki University Institute of Tropical Medicine Professor
- 2020 - 現在 Nagasaki University School of Tropical Medicine and Global Health (TMGH) Professor
- 2019 - 現在 Kitasato University Graduate School of Medical Sciences Adjunct Professor
- 2003 - 現在 George Washington University School of Public Health and Health Services, Department of Global Health Adjunct Professor
- 2014 - 2020 Japna International Cooperation Agency (JICA) Human Development Department Senior Adviser on Health and Nutrition
- 2012 - 2014 Ministry of Health, Socialist Republic of Vietnam Project for implementing maternal and child health handbook for scaling up nationwide Chief Adviser
- 2011 - 2012 World Health Organization (WHO) Headquarters, HIV/AIDS Department Senior Epidemiologist
- 2010 - 2011 World Health Organization (WHO) Headquarters, Global Health Workforce Alliance Deputy Executive Director Coordinator
- 2009/04 - 2010/03 The University of Tokyo Graduate School of International Health, Department of Global Health Policy Adjunct Professor
- 1997 - 2009 The University of Tokyo Graduate School of International Health Visiting Researcher
- 2004 - 2006 World Food Progrmme of United Nations (WFP) Headquarters, Emergency Needs Assessment Unit Senior Programme Adviser
- 2003 - 2004 Engineering Consulting Firms Association (ECFA), Jpan Research Department Director of Resaerch Department, Principal Researcher
- 2003 - 2004 World Health Organization (WHO) Regional Office for the Eastern Mediterranean (EMRO), Centre of Environmental Health Activiites (CEHA) Temporary Adviser
- 2001 - 2002 Kyushu University of Health and Welfare School of Social Welfare Adjunct Associate Professor
- 2000 - 2002 Engineering Consulting Firms Association (ECFA), Japan Research Department Direct
- 1997 - 2000 Ministry of Health, Republic of Ghana Project for Strengthening In-Service Training System Health Workforce Development Specialist
- 1995 - 1997 Engineering Consulting Firms Association (ECFA), Japan Japan Development Institute (JDI) Associate Researcher
- 1994 - 1995 International Federation of Red Cross & Red Crescent Societies (IFRC) Russina Far East Delegation Regional Relief & Logistic Delegate
- 1993 - 1993 World Health Organization (WHO) Western Pacific Regional Office (WPRO), Environmental Health Division Research Fellow
- 1991 - 1992 Sunagawa Public High School Science Department Science Teacher
- 1988 - 1990 Zorzor Rural Teachers Training Institute (ZRTTI) Science Department Chair, Science Department
- 1983 - 1988 Shinozaki Public High School Science Department Science Teacher