| 09/2005 - present: | Associate Research Scientist, Obesity Research Center, Institute of Human Nutrition and Dept. of Pediatrics, Columbia University, NY. |
| 09/2000 - 08/2005: | Postdoctoral fellow, Obesity Research Center, Institute of Human Nutrition, Columbia University, NY. |
| 04/2000 - 08/2000: | Research Assistant, Dept. of Pediatrics, University of Hong Kong, H.K. |
| 07/1990 - 12/1996: | Research Assistant, Nutrition Laboratory, Beijing Research Institute of Pediatrics; and Resident Pediatrician, Beijing Children's Hospital. |