Residency : Dept. of Ophthalmology, Seoul National University Hospital 2000 (Sep-Oct)WHO Fellowship : Low Vision Rehabilitation Center, Massachusetts Eye and Ear Infirmary, Boston, MA 2006-2007 Research Fellow, Glaucoma Service, Department of Ophthalmology, Massachusetts Eye and Ear and Harvard Medical School 2014.9~Professor, Department of Ophthalmology, Kangnam Sacred Heart Hospital, Hallym University