| 2015 ~ present | Professor, Department of Physics and Astronomy, Seoul National University |
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| 2010 ~ 2015 | Associate Professor, Department of Physics and Astronomy, Seoul National University |
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| 2006 ~ Aug. 2010 | Assistant Professor, Department of Physics and Astronomy, Seoul National University. |
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| 2002 ~ Aug. 2006 | Postdoctoral Research Associate (mentor: Taekjip Ha along with Jeffrey O. White in 2002), Department of Physics, Howard Hughes Medical Institute, University of Illinois at Urbana-Champaign. |
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| 2001 | Postdoctoral Research Associate (mentor: Dai-Sik Kim), Department of Physics, Seoul National University, Korea. |
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| 2000 | Postdoctoral Research Associate (mentor: Wonho Jhe) Center for Near-field Atom-photon Technology, Seoul National University, Korea. |
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