After receiving a PhD from Seoul National University he worked at Bonn University, Germany; DESY (Deutsches Elektronen-Synchrotron), Germany; Carnegie Mellon University, USA; McMaster University, Canada; CERN (European Organization for Nuclear Research), Switzerland; and KIAS (Korea Institute for Advanced Study), Korea; before joining Chung-Ang University in 2013. His research field is theoretical particle physics and cosmology beyond the Standard Model.