He is the Scientific Director of the Population Health Research Network and the Director of the Quebec Public and Population Health Research Training Program. He has conducted community-based CVD prevention research in low-income populations and aboriginal communities as well as research on the epidemiology of CVD risk factors particularly in children and adolescents. He is the principal-investigator of a large trial of dissemination of best practices for CVD prevention in Quebec and is involved in studies of the metabolic consequences of obesity in children and of the natural history of the development of nicotine addiction in novice smokers.