- 2020/05 - 現在 Tohoku University Graduate School of Pharmaceutical Sciences Associate Professor
- 2008/05 - 2020/04 Tohoku University Graduate School of Pharmaceutical Sciences Assistant Professor
- 2007/11 - 2008/04 Tohoku University, Sendai, Japan Graduate School of Pharmaceutical Sciences Visiting Scholar
- 2005/10 - 2007/08 University of Pennsylvania School of Medicine Center of Excellence in Environmental Toxicology Director of biomarker facility core
- 2004/07 - 2007/08 University of Pennsylvania School of Medicine Department of Pharmacology Research assistant professor
- 2001/08 - 2004/06 University of Pennsylvania School of Medicine Center for Cancer Pharmacology Research associate
- 1999/10 - 2001/07 University of Pennsylvania School of Medicine, Philadelphia, PA, USA Center for Cancer Pharmacology Postdoctoral Research Fellow
- 1992/10 - 1999/09 Korea Institute of Science & Technology (KIST), Seoul, Korea Bioanalysis & Biotransformation Research Center Research Scientist
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