1989 M.D., University of Tokyo School of Medicine, Tokyo, Japan
1997 Ph.D., University of Tokyo Graduate School of Medicine, Tokyo, Japan (research guidance partially entrusted to Massachusetts General Hospital and Harvard Medical School)
Training
1989-1991 Resident in Internal Medicine, University of Tokyo Hospital, Tokyo, Japan
1991-1993 Endocrine Fellow, 4th Department of Internal Medicine, University of Tokyo School of Medicine, Tokyo, Japan
1993-1997 PhD Student, University of Tokyo Graduate School of Medicine, Tokyo, Japan
1995-1998 Research Fellow in Medicine, Massachusetts General Hospital & Harvard Medical School, Boston, MA