- Severance Hospital clinical instructor
- Director of Internal Medicine, Myongji Hospital
- Exchange Professor, University of Michigan, USA
- Director of Internal Medicine, International St. Mary's Hospital, Catholic Kwandong University
- Director of Endocrine Diabetes Center at Catholic Kwandong University International St. Mary's Hospital
- Professor at Catholic Kwandong University International St. Mary's Hospital
- SICEM 2015
- 43rd ECTS (European Calcified Tissue Society Congress)
- European Calcified Tissue Society Congress (ECTS)
- Former) President of the Korean Osteoporosis Society
