"Education" 2002.08 Doctoral studies, Seoul National University, Medical College, Seoul, Korea 1997.02 Master's degree, Seoul National University, Medical College, Seoul, Korea 1988.02 Bachelor's degree, Seoul National University, Medical College, Seoul, Korea "Work experience" 2017.04 ~ Chief Professor, Department of Pediatrics, Faculty of Medicine, Sungkyunkwan University 2017.04 ~ Head of Department, Department of Pediatrics, MC Samsung 2013.08 ~ Director, Educational Center, MC Samsung 2009.03 ~ Professor, Department of Pediatrics, MC Samsung, Faculty of Medicine of Sungkyunkwan University 2009.09 ~ 2013.07 Director, Pediatric Oncology Center, MC Samsung 2002.10 ~ 2009.02 Associate Professor, Department of Pediatrics, MC Samsung, Faculty of Medicine Sungkyunkwan University 2002.08 ~ 2004.03 Researcher, Cancer Center of Indiana Medical University 1999.03 ~ 2002.09 Assistant Professor, Department of Pediatrics, MC Samsung, Faculty of Medicine of Sungkyunkwan University 1998.03 ~ 1999.02 Specialist, Department of Pediatrics, MC Samsung, Faculty of Medicine of Sungkyunkwan University 1997.03 ~ 1998.02 Researcher, Department of Pediatrics, MC Samsung, Faculty of Medicine of Sungkyunkwan University 1996.03 ~ 1997.02 Researcher, Department of Pediatrics, Seoul National University Hospital University 1992.03 ~ 1996.02 Residency, Department of Pediatrics, Seoul National University Hospital