He has promoted the validation and use of accelerometer-based devices in the assessment of physical activity in research and population surveillance. Dr. Troiano is interested in promoting improved understanding of the information obtained from devices and self-reports and the analytic implications of different data sources. Dr. Troiano has supported federal efforts to promote health-enhancing physical activity, as evidenced by his details to the Office of the Surgeon General to support development of Step it Up! The Surgeon General's Call to Action to Promote Walking and Walkable Communities and to the Office of Disease Prevention and Health Promotion to serve as Coordinator for the development of 2008 Physical Activity Guidelines for Americans as well as his role as co-executive secretary for the Physical Activity Guidelines for Americans, 2nd edition.