He also had multiple medical information related positions at Asan Medical Center. He has been actively engaged several projects in the field of medical informatics such as emergency medical informatics, clinical decision support, and mobile health. From this year (2015) he works as Secretary General of the Korean Society of Medical Informatics. He is one of cofounders and Director of Public Relation of the Korean Society for Patient Safety. From Aug, 2013 to Feb, 2015, he is staying at the Division of General Medicine and Primary Care, Brigham Women’s Hospital, Boston, MA, USA as a postdoctoral research fellow to study how to improve patient safety through health information technology under the supervision of Dr. David W. Bates.