- Jan. 2021 – present President, Science and Technology Policy Institute(STEPI)
- Dec. 2018 – Dec. 2019 Vice Miniter, Ministry of Science and ICT of the Republic of Korea
- Jun. 2017 – Dec. 2018 Adviser to the President for Science and Technology, Office of the President of the
Republic of Korea
- May. 2016 – Jun. 2017 Congressperson, Member of the National Assembly of the Republic of Korea
- Jan. 2011 – Feb. 2016 General Manager, WISET, commissioned by Ministry of Edu., Sci, and Tech.
- Mar. 2009 – Feb. 2010 Director, Research Institute affiliated KW-u-Globe Inc.,
- Sep. 2003 – Feb. 2009 Research Professor, WISE Center, Ewha womans university, Korea
- Sep. 2000 – Aug. 2003 Research Professor, IPAP(Institute of Physics and Applied Physics), Yonsei University,
Korea
- May 1999 – Aug. 2000 Researcher, IPAP, Yonsei University, Korea
- Mar. 1997 – Apr. 1999 Researcher, Department of Physics, Ewha Womans University, Korea