- Severance Hospital Intern
- Severance Hospital Resident
- Severance Hospital clinical instructor
- Severance Hospital clinical research assistant professor
- Director of Nephrology Department, Seoul Bumin Hospital
- Director of the Kidney Center at Catholic Kwandong University International St. Mary's Hospital
- Department of Nephrology, Catholic Kwandong University International St. Mary's Hospital
- Director of Training and Education, Catholic Kwandong University International St. Mary’s Hospital
- Associate Professor, Catholic Kwandong University International St. Mary's Hospital
