John M. Jakicic, PhD is a Distinguished Professor and is the Director of the Healthy Lifestyle Institute at the University of Pittsburgh. Dr. Jakicic has a national and international reputation as a leading scholar in this area of physical activity, and this builds on a line of research to determine the appropriate dose of physical activity for long-term body weight regulation and related chronic diseases across the lifespan. Within this line of research Dr. Jakicic studies the interaction between energy expenditure and energy intake, the influence of these factors on body weight regulation, and the biological and behavioral pathways by which physical activity impacts health-related outcomes. Dr. Jakicic has served on various national and international committees to develop physical activity guidelines for the prevention and treatment of obesity and other chronic conditions, which included the 2018 Physical Activity Guidelines for Americans Advisory Committee. Thus, he has been influential in the heightened awareness of physical activity and sedentary behavior as a key lifestyle factors related to health.