- 2007/04 - 2023/03 Associate Professor, Division of Molecular Cell Immunology and Allergology, Advanced Medical Research Center ,Nihon University Graduate School of Medical Sciences
- 2021/04 - Nihon University Itabashi Hospital Center for Allergy Director of Center for Allergy
- 2002/06 - 2007/03 Associate-Unit Director, Research Unit for Allergy Transcriptome, RIKEN Research Center for Allergy & Immunology
- 2001/06 - 2002/05 Assistant Professor, First Department of Internal Medicine, Gunma University Hospital
- 1998/06 - 2001/05 Visiting Scientist, Laboratory of Allergic Diseases, National Institutes of Health, Bethesda, USA
- 1997/06 - 1998/05 Assistant Professor, First Department of Internal Medicine, Gunma University Hospital
- 1995/06 - 1997/05 Clinical Staff, First Department of Internal Medicine, Gunma University Hospital
- 1994/07 - 1995/05 Senior Research Fellow, Clinical Pharmacology, University of Southampton, U.K.
- 1989/07 - 1994/06 Research Fellow, Clinical Pharmacology, University of Southampton, U.K.
- 1985/06 - 1989/06 Internal Medicine Resident, First Department of Internal Medicine, Gunma University, Faculty of Medicine, School of Medicine and clinical staff of regional hospitals