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Stellar Evolution and Stellar Populations
Galaxy Formation and Evolution
Near-field and Supernova Cosmology
| Period | Institution | Position / Title |
| Jul. 2026 – Sep. 2026 | Yunnan National Astronomical Observatories, Chinese Academy of Sciences, China | Visiting Professor |
| Aug. 2019 – Oct. 2019 | University of Padova, Italy | Visiting Professor |
| Aug. 2011 – Aug. 2012 | Harvard University and the Center for Astrophysics (CfA), USA | Visiting Professor |
| Jan. 2010 – Feb. 2010 | Harvard University and the Center for Astrophysics (CfA), USA | Visiting Professor |
| Jul. 2009 – Aug. 2009 | National Astronomical Observatory of Japan (NAOJ) and University of Tokyo, Japan | Visiting Professor |
| Jul. 2008 – Aug. 2008 | University of Bonn, Germany | Visiting Professor |
| 2014 – Present | Yonsei University | Full Professor |
| 2009 – 2014 | Yonsei University | Associate Professor |
| 2005 – 2009 | Yonsei University | Assistant Professor |
| 2002 – 2005 | University of Oxford, UK | Oxford Glasstone Postdoctoral Research Fellowship |
| 1998 – 2002 | Center for Space Astrophysics (CSA), Yonsei University | Researcher |
| 1996 – 2002 | Institute of Natural Sciences, Yonsei University | Researcher |
Former Director of the Institute of Earth-Atmosphere-Astronomy, Yonsei University, Korea (2022 – 2026)
Former Chair of the Graduate School of Earth-Astronomy-Atmosphere, Yonsei University, Korea (2022 – 2026)
Former Vice Dean of the College of Science, Yonsei University, Korea (2020 – 2021)
Former Director of Yonsei University Observatory, Korea (2017 – 2020)
Former Chair of the Department of Astronomy, Yonsei University, Korea (2012 – 2014, 2021)
Former Director of the Center for Astronomy & Space Science, Yonsei University, Korea (2012 – 2014, 2021)
Former Committee Member of the “IAU GA 2022 in Korea” Bidding, Steering, and Organizing Committees, Korean Astronomical Society (2014 – 2015 / 2016 – 2020 / 2021 – 2022)
Glasstone Postdoctoral Fellow, University of Oxford, United Kingdom (2002 – 2005)