2001.3-2002.2  Internship, Asan Medical Center, Seoul, Korea                        

2004.3-2008.2  Resident Physician, Department of Internal Medicine, Asan Medical Center, Seoul, Korea 

2008.3-2010.2  Clinical Fellow, Division of Endocrinology & Metabolism, Department of Internal Medicine

                         Asan Medical Center, Seoul, Korea                                            

2010.3- 2010.7  Senior Fellow (Instructor), Division of Endocrinology & Metabolism, 

                          Department of Internal Medicine, Asan Medical Center, Seoul, Korea

2010.8-2013.1  Post-Doctoral Fellow,  Gene Regulation section (Dr. Shene-yann Cheng)  

                         Laboratory of Molecular Biology, Center for Cancer Research,

                         National Cancer Institute, National Institutes of Health, USA

2013.3-2018.3  Assistant Professor, Division of Endocrinology, Department of Internal Medicine

                         Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

2018.4- 2024.2  Associate Professor, Division of Endocrinology, Department of Internal Medicine

                         Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

2019.3-2020.2  Visiting Research Scholar, Laboratory of Molecular Biology, Center for Cancer Research,

                         National Cancer Institute, National Institutes of Health, USA

2024.3- Present  Professor,  Division of Endocrinology, Department of Internal Medicine

                           Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea