He is a Medical Geneticist at Asan Medical Center, Seoul, Korea. Also serve as a Professor at University of Ulsan College of Medicine, Seoul, Korea. He participated in multiple clinical trials with focus studies on rare genetic disorder such as Neurofibromatosis, Lateralized overgrowth syndrome, Fatty acid oxidation disorder and Lysosomal storage disorders. He has presented and published at least 160 scientific papers in highly reputable journal and scientific meetings.