Dr. Friesen received a Ph.D. and M.Sc. in occupational and environmental health from the University of British Columbia in Vancouver, Canada. She completed postdoctoral studies at Monash University in Melbourne, Australia, and at the University of California at Berkeley. She is a Senior Investigator at the U.S. National Cancer Institute in the Occupational and Environmental Epidemiology Branch of the Division of Cancer Epidemiology and Genetics. Dr. Friesen's research focuses on quantitative assessment strategies to characterize study participants' workplace exposures through their entire working life to minimize exposure misclassification in occupational epidemiologic studies. She has focused on improving exposure estimates, evaluating the robustness of exposure-response relationships to exposure assessment strategies, and using statistical models for both developing exposure metrics and evaluating their exposure-response relationships.