Regular member of Korea Society of Ophthalmic Plastic & Reconstructive Surgery Regular member of Korean Association of Pediatric Ophthalmology and Strabismus Regular member of Korean Society of Neurophthalmology Board of trustee of KSOPRS General & Academic director of KSOPRS Academic committee of the Korean Thyroid Association Director of the Asia Pacific Society of Korea Society of Opthalmic Plastic & Reconstructive Surgery Member of the American Academy of Ophthalmology Member of American Society of Ophthalmic Plastic & Reconstructive Surgery Editor Board of the Journal of Korean Opthalmological Society Editor of Korean Journal of Ophthalmology Member of the Planning and Coordination committee, Bundang CHA medical center