She is appointed as a Scientist at Cancer Care Ontario and in the Occupational Cancer Research Center. She completed her PhD in Epidemiology in Toronto in 1999 and her MSc in Toxicology and BSc in Environmental Biology and International Agriculture at the University of Guelph. Dr. Harris conducts research with a focus in occupational and environmental cancer epidemiology. She specializes in the development of methods to measure and predict occupational and environmental exposures for large-scale epidemiologic studies and developing methods to estimate human exposures to contaminants using biological markers and questionnaire-based assessment.