Doctor of Medicine, Kyung Hee University College Medicine, 1994. Doctor of Philosophy, Graduate School Kyung Hee University, 2005.
Internist Kyung Hee University Hospital, Seoul, Republic of Korea, 1994—1995, resident, department internal medicine, 1995—1999, fellow, department endocrinology & metabolism, 2002—2005. Instructor, department endocrinology & metabolism Konyang University Hospital, Daejeon, 2005—2006. Assistant professor, department internal medicine Jeju National University School Medicine, 2006—2009, associate professor, since 2010.