Noh Gyeongseon (M) moved to America after graduating from Yonsei University College of Medicine, holding the position of Professor of Pediatric Psychology at Columbia University, the University of Maryland-College Park, and the Illinois State University while working as a psychiatrist and pediatric psychiatrist specialist for around 30 years. After returning to Korea, he worked as the Director of Pediatric Psychiatry at Kangbuk Samsung Hospital, a Clinical Psychology Professor at the School of Medicine of Sungkyunkwan University, and Chairperson of the Korean Academy of Child and Adolescent Psychiatry. He is the most-noted doctor in this field, known to have opened up a new horizon in domestic pediatric psychological treatments. Following his retirement, he has been lecturing at Yonsei University College of Medicine, Sungkyunkwan University School of Medicine, Seoul Women's University and elsewhere. He wrote What it Means to Raise Children Well.