Dr Gaston Godin is Canada Research Chair on Behaviour and Health (Canadian Institutes of Health Research, Tier 1), 2004-2011. He is also the principal investigator of several research projects and the scientific director of the research group on behaviour in the field of health. This group has as its unifying research theme, the study of processes of adoption and change of behaviours in the field of health. This group is mainly interested in the investigation of methodological and basic theoretical issues related to the prediction of behaviour in the field of health. He is currently involved in projects investigating the determinants of healthy behaviours (i.e., physical activity and nutrition) in subjects with and without a genetic susceptibility to obesity and the regular practice of physical activity in a cohort of high school adolescents. Gaston Godin received his Ph.D. in Community Health, with an emphasis on behavioural sciences in 1983, from the University of Toronto, Canada. Since then, his research implications have included health promotion and disease prevention initiatives, and the study of behaviours in the field of health (e.g., exercising). Among the well known products of his research program are the Godin Leisure-Time Exercise Questionnaire (Godin & Shephard, 1986) and the narrative review of the applications of the Theory of Planned Behaviour to health-related behaviours (Godin and Kok, 1996). With respect to this latter topic, he was one of the first scientists to apply the Theory of Reasoned Action (later to become the Theory of Planned Behavior) to health-related behaviours, especially physical activity. Between 1976 and 1985, Dr Godin was an Associate Professor at the Faculty of Education (Department of Physical Education) at Laval University. In 1985, he became a Full Professor with the Faculty of Nursing Sciences at the same institution. Over the years, he has also been Visiting Professor on several occasions: at Harvard School of Public Health in the 1987-88 academic year; at the Deprtent of Health Education and Promotion, Maastricht University, The Netherlands, in the 1994-95 academic year; at the Department of Psychology, the University of Sheffield, and the School of Psychology at the University of Leeds, United Kingdom, in the 2002 academic year.