- 2001 - 2003 大阪府立成人病センター研究所・生化学部長
- 2001 - 2003 Director, Department of Developmental Biology and Medicine, Osaka Medical Center for Cancer and Cardiovascular Diseases
- 2003 - - 広島大学原爆放射線医科学研究所・幹細胞機能学研究分野・教授
- 2003 - - Professor, Department of Stem Cell Biology, Research Institute for Radiation Biology and Medicine, Hiroshima University
- 1994 - 2001 Osaka University Research Institute for Microbial Diseases
- 1994 - 2001 Associate Professor, Research Institute for Microbial Diseases, Osaka University
- 1990 - 1994 Osaka University Research Institute for Microbial Diseases
- 1990 - 1994 Research Associate, Research Institute for Microbial Diseases, Osaka University
- 1989 - 1990 佐賀県立病院好生館
- 1989 - 1990 Saga Prefectural Hospital Kouseikann
- 1990 - 医療法人三信会原病院
- 1990 - Sannshinnkai Hara Hospital
- 1986 - 1989 University of Toronto
- 1986 - 1989 Visiting fellow (MRC fellow), Ontario Cancer Institute, University of Toronto (Tak W.Mak's Laboratory)
- 1980 - 1981 研修医・九州大学医学部付属病院
- 1980 - 1981 Residenct, Kyushu University Hospital
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