| 1976-80 | Faculty of Letters, The University of Tokyo |
| 1980 | B.A. in European History, The University of Tokyo |
| 1980-88 | Graduate School of Humanities, The University of Tokyo |
| 1982 | Master of Letters in European History, The University of Tokyo |
| 1984-90 | Graduate School, Yale University. U.S. |
| (Harvard Yenching Institute, Doctoral Scholarship for Junior Faculty,1984-88j | |
| 1986 | M.A. in History, Yale University |
| 1987 | M.Phil. in History, Yale University |
| 1989-90 | Visiting Scholar, The University of Cambridge, U.K. |
| 1990 | Ph.D. in History, Yale University |
| 1990 | # Robert S. Lopez Memorial Prize, Yale University |
| 1990-93 | Associate Professor (Economic History), Faculty of Economics, Hitotsubashi University, Tokyo |
| 1993-98 | Associate Professor, Institute of Cross-Cultural Studies, Faculty of Letters, The University of Tokyo |
| 1993 | # Suntory Award |
| 1994 | # Collegium Mediterranistarum Award |
| 1994 | # Premio Marco Polo |
| 1995-96 | Visiting Fellow, Ecole des Hautes Etudes en Science Sociale, Paris, France |
| 1998-2004 | Associate Professor, Institute of Cross-Cultural Studies, Graduate School of Humanities and Sociology, The University of Tokyo |
| 2001-2004 | Associate Professor, Department of Occidental History, Graduate School of Humanities and Sociology, The University of Tokyo |
| 2002 | Department of Education Resident in Medieval Studies, American Academy in Rome, Rome, Italy |
| 2004- | Professor, Department of Occidental History, Graduate School of Humanities and Sociology, The University of Tokyo |
| 2009 | CMRS Distinguished Visiting Scholar, UCLA, USA |
| The Historical Society of Japan | Councillor | 1994-present |
| Auditor | 1994-95 1998-99 |
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| Director | 1995-97 2003-05 2006-08 2009-11 |
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| Japan Society for Medieval European Studies | Preparatory Committee | 2007-09 |
| Co-executive director | 2008-10 | |
| Executive director | 2010-present | |
| Standing Committee | 2009-present | |
| Collegium Mediterranistarum (Mediterranean Academy of Japan) | Standing Committee Member | 1999-present |
| Shigaku Kenkyukai | Councillor | 2004-present |
| Ministry of Education | The 21st Century COE (Centers of Excellence) Program@Selection & Evaluation Committee of Humanities | 2002-03, 04-05, 07 |
| The Japan Society for the Promotion of Science | Research Center for Science Systems@Program Officer in Humanities | 2004-07 |
| Science Council of Japan | Associate Member in Humanities | 2006-present |
| Ministry of Education, Culture, Sports, Science and Technology | Science Officer (Humanities) | 2008-present |