- 2002 - 2005 広島大学原爆放射線医科学研究所教授
- 2002 - 2005 Professor, Research Institute for Radiation Biology and Medicine
- 2005 - - 東京大学大学院医学系研究科教授
- 2005 - - Professor, Graduate School of Medicine, The University of Tokyo
- 1997 - 2002 広島大学原爆放射能医学研究所教授
- 1997 - 2002 Professor, Research Institute for Radiation Biology and Medicine
- 1996 - 1997 広島大学原爆放射能医学研究所助教授
- 1996 - 1997 Associate Professor, Research Institute for Radiation Biology and Medicine
- 1995 - 1996 東京大学医学部附属病院第三内科助手
- 1995 - 1996 Research Associate, Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo
- 1991 - 1995 Medical Research Council 人類遺伝学部門研究員
- 1991 - 1995 Researcher, Medical Research Council Human Genetics Unit
- 1995 - 東京大学医学部附属病院第三内科医員
- 1995 - Research Assistant, Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo
- 1990 - 1991 東京大学医学部附属病院第三内科助手
- 1990 - 1991 Research Associate, Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo
- 1988 - 1990 東京大学医学部附属病院第三内科医員
- 1988 - 1990 Research Assistant, Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo
- 1986 - 1988 国立がんセンター研究所研究員
- 1986 - 1988 Researcher, National Cancer Center Research Institute
- 1985 - 1986 自治医科大学附属病院レジデント
- 1985 - 1986 Resident, Jichi Medical School Hospital
- 1984 - 1985 東京大学医学部附属病院研修医
- 1984 - 1985 Resident, University of Tokyo Hospital