1989　 Joined Ministry of Health and Welfare

1999　 First Secretary, Embassy of Japan in the United States of America

2004　 Director, Long-Term Care Insurance Division, Hyogo Prefectural Government

2006　 Director for the Securement of Nurses, Nursing Division,  Health                 Policy Bureau, Ministry of Health, Labour and Welfare (MHLW)

2008　 Director for Planning and Research, Health Economics Division, Health 　         Insurance Bureau, MHLW

2010　 Professor, Graduate School of Public Policy, University of Tokyo

2012　 Director, Family Welfare Division, Equal Employment and Children and    Family Welfare Bureau, MHLW

2014　Director, Planning Division, National Institute of Population and Social Security Research

2016　 Professor, National Graduate Institute for Policy Studies

2019　Special Research Officer for Social Security, Office of Director-General for  General Policy and Evaluation, MHLW

2020　Professor, National Graduate Institute for Policy Studies

”Articles review on the issue of inequity among different schemes of Thai public health financing system and comparison with the experience of Japan”, GRIPS Discussion Paper Series, DP 20-12, (2021)

"日本的社会保障历史发展及当前问题　(Historical development and current issues for social security in Japan)", 社会保障评论 (Chinese Social Security Review), Vol.3 (11), pp.14-23, (2019)

“Establishment of the concept of social security in Japan and Bunji Kondo – Focusing on the relevance to the “1950 Recommendation””, Social Policy, Vol.11, No.1 (32), pp.85-92（2019）

“The transition in the Structure of the Social Security Revenue (FY 1969 to 2014): An Overview”, Journal of Social Security Research, Vol.3, No.1, pp.22-39、(2018)

“Transformation of the “Okochi-theory” in his Later Life and its Effect to the Advisory Council on Social Security”, Social Policy, Vol.9, No.2 (27),　pp.123-134 (2017)

"Social Security Policy at Local Government in an Aging and Depopulation Society", Academia, Vol.122, pp.8-13、(2017)

“Process for the establishment of Lähihoitaja and its implication for Japan”, Journal of Social Security Research, Vol.1, No.1, pp.148-163、(2016)

“Current status of CCRC (Continuing Care Retirement Communities) in California and its implication for Japan”, Aging in Place (Foundation for Senior Citizens’ Living), Vol.131-2, pp.44-60・31‐45、(2016)

“Political Process and Philosophy of Social Security” (2014) (Authored)