Editor, Frontiers in Endocrinology: Bone Research, 2014-present. Editorial Board, JAMA: Pediatrics, A Journal of the American Medical Association, 2012-present. Associate Director University of Iowa Obesity Research and Education Initiative, 2011-present. Writing Committee and Chair Physical Activity and Exercise Section – National Osteoporosis Foundation (NOF) Peak Bone Mass. Revision of NOF position statement on peak bone mass. 2014-present. Steering Committee - National Academy of Kinesiology. Collegiate Fitness Index ad hoc committee to develop a national initiative to increase physical activity on college campuses including the development of the National Collegiate Fitness Index Survey. National Academy of Kinesiology, American College of Sports Medicine and the American Academy of Kinesiology, 2011-present. Writing Committee – Federal Advisory Committee Department of Health and Human Services. The Physical Activity Guidelines for Americans Midcourse Report: Strategies for Increasing Physical Activity Among Youth, 2012-present. http://www.health.gov/paguidelines/midcourse/default.aspx. Member Fraternal Order Eagles Diabetes Research Center, 2011-present. Grant Reviewer, Office of the Vice President for Research and Economic Development Standing Committee for Review of Internal Funding Initiatives. 2013-2016.