December 1983 - March 2005: Doctor of Surgery, National Children's Hospital;
April 2005 - January 2006: Doctor, Deputy Head of Surgery Department, National Children's Hospital;
February 2006 - June 2013: Main Doctor, Deputy Head of Surgery Department, National Children's Hospital;
July 2013 - July 2015: Main Doctor, Doctor of Medicine, Deputy Head of Department in charge of Surgery Department, National Children's Hospital;
August 2015 - September 2015: Main Doctor, Doctor of Medicine in Surgery Department, National Children's Hospital;
October 2015 - August 2020: Main Doctor, Associate Professor, Doctor of Medicine in the Department of Surgery, National Children's Hospital.
August 2020 - February 2022: Part-time pediatrician, in charge of pediatric surgery unit, Vinmec Times City International Hospital
March 2022 - Until now: Full-time pediatrician, Vinmec Times City International Hospital