| 1962-1965 | Clinical Chemist, Chemistry teacher, Taiwan Provicial Taichung Hospital, 1-Ning High School |
| 1965-1969 | Research Associate, Endocrinology Division, St. Luke's Hospital Center |
| 1970-1974 | Chemist, Body Composition Unit, St. Luke's Hospital Center |
| 1975-present | Scientific Associate, Medicine, Columbia University |
| 1975-2001 | Associate Director, Body Composition Unit, St. Luke's Hospital Center |
| 2002-present | Co-Director, Body Composition Unit |