She worked as a postdoctoral fellow at the Occupational and Environmental Epidemiology Branch, National Cancer Institute, National Institutes of Health. Dr. Hwang received her Ph.D. in Industrial Hygiene (major) and in Biostatistics (minor) and M.S. in Environmental Health Sciences from the University of Minnesota. Her research has focused on evaluation of the relationship between occupational exposure to specific contaminants and adverse health effects in several different industries including mining, agricultural, and public safety (firefighters). In particular, her research conducts the development of new exposure assessment methods to characterize occupational exposures for health studies.