John McLaughlin is Chief Science Officer at Public Health Ontario, a Professor of epidemiology at U of T’s Dalla Lana School of Public Health, and a Fellow in the Canadian Academy of Health Sciences. He is recognized for his studies of the role of environmental and genetic causes of disease across Canada’s diverse populations. He has also worked to improve health across the whole population, such as in serving as vice-president at Ontario’s cancer agency, where while running province-wide prevention and screening programs he directed the launch of Canada’s first population-based colorectal screening program. Previous appointments also included that he was a Senior Visiting Scientist at the International Agency for Research on Cancer, and founding director for the Ontario Health Study, Canada’s largest, prospective cohort study. As a scholar he has more than 300 publications, and he has supervised and mentored many graduate students and new investigators.