- Clinical instructor at Seoul National University Hospital
- Assistant Professor, Catholic Kwandong University School of Medicine
- Director of Training Education Department 2, Catholic Kwandong University International St. Mary's Hospital
- Department of Neurology, Catholic Kwandong University International St. Mary's Hospital
- Director of the Medical Cooperation Center at Catholic Kwandong University International St. Mary’s Hospital
- Director of the International Medical Center at Catholic Kwandong University International St. Mary's Hospital
- Associate Professor, Catholic Kwandong University International St. Mary's Hospital
- General Affairs Director, Korean Sleep Research Society
- Public relations committee member of the Neuroscience Society
- Neuroscience Society Sleep Special Committee Member
- Special committee member of adjacent societies of the Neuroscience Society
- Member of the Korean Narcolepsy Research Association
