- 2015/04 - 2020/03 International Christian University The Department of Politics and International Studies, The College of Liberal Arts Professor with Special Appointment of Political Thought
- 2014/09 - 2016/03 International Christian University Peace Research Institute Director
- 2013/04 - 2015/03 International Christian University The Department of Politics and International Studies, The College of Liberal Arts Department Chair
- 2012/04 - 2015/03 Graduate School of Waseda University The Division of Political Science Visiting Professor (Part-time)
- 1995/04 - 2015/03 International Christian University The Division of Social Science, The College of Liberal Arts Professor of Political Thought
- 2012/05 - The Center of Theological Inquiry, Princeton, NJ, USA Visiting Professor
- 2010/04 - 2011/03 The Graduate School of International Christian University The Program of Public Policy and Social Research, The Division of Arts and Sciences Program Director
- 2008/04 - 2010/03 International Christian University The Department of Politics and International Relations, The College of Liberal Arts Department Chair
- 2002/04 - 2006/03 The Graduate School of International Christian University Public Administration The Dean of the Graduate School
- 1995/04 - 1998/03 Division of Social Sciences, College of Liberal Arts, International Christian University Division of Social Sciences, College of Liberal Arts Chair of the Division of Social Sciences, College of Liberal Arts
- 1988/04 - 1995/03 International Christian University The Division of Social Science, The College of Liberal Arts Associate Professor of Political Thought
- 1992/09 - 1994/08 Amherst College, Amherst, MA, USA The Department of Political Science, The Department of Religious Studies Fulbright and ACLS Visiting Researcher
- 1986/04 - 1988/03 International Christian University The Division of Social Science, College of Liberal Arts Assistant Professor of Political Thought
- 1984/04 - 1986/03 Instructor of Political Thought International Christian University The Division of Social Science, The College of Liberal Arts Instructor of Political Thought
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Japanese Political Science Association (JPSA)
, Japan Association of American Studies
, The Japan Association for Studies in Christianity
, American Political Science Association (APSA)
, The Conference for Studies in Political Thought (CSPT)
, The Japan Conference for the Studies in Political Thought (JCSPT)
, Editing Member of The Studies in Uchimura Kanzo
, The American Studies Association in the United States
, European Consortium for Political Research (ECPR)
, The Japanese Association for Studies in Puritanism