His research interests include model based software engineering, process improvement, and quality-driven software development. Recently, his research focuses on modeling & verification of SoS(System of Systems). Since 2002, he has directed the ITRC(Information Technology Research Center) Software Process Improvement Center, sponsored by Korean Ministry of Economy Knowledge. In 2015, he has been awarded with a “Star Lab”, a multi-year research project on Modeling and Verification of System of Systems, sponsored by the Ministry of Science, ICT, and Future Planning. He has served as editorial board members including in the Journal of Systems and Software, and Information and Software Technology. He also served as General Chair and Program Committee Chair in various international conferences such as APSEC2004, QSIC2009, COMPSAC2010. Now, he is serving as a Senior Associate Editor in the Journal of Systems and Software, and a General Co-Chair of ICSE2020 to be held in Seoul, Korea.