- Severance Hospital Intern
- Severance Hospital Resident
- Severance Hospital clinical instructor
- Gangnam Severance Hospital Clinical Research Assistant Professor
- Assistant Professor, Catholic Kwandong University School of Medicine
- Professor at Catholic Kwandong University International St. Mary's Hospital
- Regular member of the Korean Society of Transplantation
- Regular member of the Korean Society of Nephrology
- Regular member of the Korean Society of Internal Medicine
- Insurance Legislation Committee Member, Korean Society of Nephrology
