Member, Scientific Advisory Council. Michael & Susan Dell Center for Advancement of Healthy Living. The University of Texas School of Public Health, Austin Regional Campus. Austin, TX. February 14-15, 2008.

Coordinating Committee, National Plan for Physical Activity. Coordinating Committee meeting. Indianapolis, IN. January 31—February 1, 2008.

Member, Expert Panel. Review of Environmental and Policy Interventions for Childhood Obesity Prevention. Transtria, LLC and St. Louis University School of Public Health. 2008.

Member, Scientific Advisory Committee for the Research Center for Health Promotion (Hemil). Faculty of Psychology, University of Bergen, Norway. 2008-2010.

Task Force member. Active Transportation 2010 Campaign. Sponsored by the San Diego City Council and San Diego County Supervisors. 2008.

Executive Workgroup. Salud America! National Program Office. University of Texas Health Science Center at San Antonio. January 24-25, 2008.

Scientific Advisory Council. Michael and Susan Dell Center for Advancement of Healthy Living at the University of Texas School of Public Health Austin Regional Campus. February 14-15, 2008.

Organizing Committee. Measures of the Food and Built Environments: Enhancing Research Relevant to Policy on Diet, Physical Activity, and Weight. Sponsored by the National Cancer Institute. Bethesda, MD. November 1-2, 2007.

Expert Panel. California After School Resource Center. Advising on guidelines for physical activity in after school programs. Alameda County Office of Education. 2007.

Faulty for course “VIII Curso Internacional de Actividad Fisica y Salud Publica: Agita Mundo”. Sponsored by CDC, CELAFISCS, REDCOLAF. San Andres, Colombia. July 6-10, 2007.

Program Committee. Active Living Research Fourth Annual Conference and Grantee Meeting. 2006-2007.

Invited participant and consultant. “Workshop on Global Advocacy for National Physical Activity Plans.” Spronsored by CDC/WHO Collaborating Center. San Diego, CA. December 11-12, 2006.

Invited participant, “The Future of Cardiovascular Disease: Today's Decisions . . . Tomorrow's Outcomes.” Sponsored by the National Heart, Lung, and Blood Institute. NIH Campus, Bethesda, MD. September 20, 2006.

Invited participant, “Invitational Summit on Accelerating Improvement in Childhood Obesity.” Sponsored by the National Initiative for Children's Healthcare Quality. Washington , DC. September 19, 2006.

Faculty for course on “Physical Activity and Public Health”: Postgraduate course on research directions and strategies. University of South Carolina and Centers for Disease Control and Prevention. Park City, Utah, September 15-18, 2006.

Panelist, Cross-Sector Dialogue on Housing/Land Use and Mobility. Sponsored by Center for Civic Partnerships of the California Public Health Institute. Glendale, CA June 22, 2006.

International Scientific Advisory Committee. Sixth International Conference on Dietary Assessment Methods. “Complementary advances in diet and physical activity assessment.” Copenhagen, Denmark, April 2006.. 2004-2006.

Faculty for course “IV Curso International Actividad Fisica y Salud Publica”. Sponsored by CDC, IUHPE, RAFA/PANA. Puerto Vallarta, Mexico. January 26-30, 2006.

Participating Member, Cancer Prevention and Control Division, UCSD Cancer Center . University of Califonia, San Diego. 2006 to present.

Advisor. Healthy Eating and Active Communities (HEAC) Evaluation Advisory Committee. (A program of The California Endowment). Samuels and Associates. 2005-2010.

Mississippi Renewal Forum. Planning to rebuild the Mississippi Gulf Coast after hurricane Katrina. Biloxi, MS. October 14, 2005.

International Advisory Board for Healthy Alberta Communities program. Centre for Health Promotion Studies, University of Alberta, Canada. 2005-2008.

Faulty for course “III Curso International Actividad Fisica y Salud Publica”. Sponsored by CDC, IUHPE, RAFA/PANA. Heredia, Costa Rica. August 22-26, 2005.

Advisory Committee, Calfornia Governor’s Council on Physical Fitness and Sports. 2005.

Invited panelist, Childhood Obesity Prevention Research: Filling the Gaps. Sponsored by the Institute of Medicine and RTI International. Washington, DC, February 10-11, 2005.

Invited member, Virtual Network of Experts to assist in implementing the WHO’s Global Strategy on Diet, Physical Activity, and Health. January 2005 to present.

Program Committee, Cooper Institute conference on Increasing Physical Activity in Populations: Understanding Diffusion and Dissemination. Dallas, TX. October 21-23, 2004.

Co-Chair (with Cora Lewis and Catherine Loria). Predictors of Obesity, Weight Gain, Diet, and Physical Activity Workshop. National Heart, Lung, and Blood Institute. Bethesda, MD. August 4-5, 2004.

Invited participant to workshop. Modifiable Environmental and Behavioral Determinants of Overweight Among Children and Adolescents. National Institute of Diabetes, Digestive, and Kidney Diseases. Bethesda, MD. June 22-23, 2004.

Invited participant and panelist, The Time/ABC News Summit on Obesity. Williamsburg, VA. June 2-4, 2004.

Invited participant to Expert Panel Meeting. Developing a Framework for Evaluating Physical Activity Legislative Policies. National Cancer Institute. Washington, DC. April 5-6, 2004.

Member, Adolescent Technical Advisory Committee of the 2005 California Health Interview Survey. California Department of Health Services. Meeting April 1, 2004 in Los Angeles.

Member, Superintendent’s Advisory Committee on Obesity, Diabetes, and Cardiovascular Disease. California Department of Education. 2004.

Program Committee for conference: The Fourth International Conference on Walking in the 21st Century. Portland, OR. May 1-3, 2003.

Co-chair for conference: An Economic Analysis of Eating and Physical Activity Behaviors: Exploring Effective Strategies to Combat Obesity. For the Partnership to Promote Healthy Eating and Active Living. Washington, DC. April 10, 2003.

Founding member of Advisory Board of the Agita Mundo/Move for Health Network. Based in Sao Paulo, Brasil. 2003-2005.

Faculty for course on “Physical Activity and Public Health”: Postgraduate course on research directions and strategies. University of South Carolina and Centers for Disease Control and Prevention. Park City, Utah, September 20-24, 2002.

Scientific Panel on Obesity and Physical Fitness. Advising on analysis and use of statewide fitness test results. California Center for Public Health Advocacy. Sacramento, CA. 2002

Member, International Advisory Board for Physical Activity, Sport, and Health Policy Research Centre of the Flemish Government. A multi-university center in Belgium. 2002-2006.

Member, Board of Advisors for Kalsugan Community Services and Filipino-American Wellness Center. San Diego, CA. 2002 to present.

Co-Moderator of Working Group on Transportation Impacts on Human Health, Especially Physical Activity. Transportation Research Board. Conference on Environmental Research Needs in Transportation. Washington, DC, March 21-23, 2002.

Advisory Committee for Building Bridges, A Robert Wood Johnson Foundation conference series. 2001-2002.

Faculty for course on “Physical Activity and Public Health”:  Postgraduate course on research directions and strategies.  University of South Carolina and Centers for Disease Control and Prevention.  Hilton Head, S.C., September 25-27, 1999.

Scientific Advisory Council.  Rocky Mountain Prevention Research Center.  University of Colorado School of Medicine, Denver.  1999-2003.

Advisory Committee for California Youth Health Assessment Program.  Implementing Senate Bill 707.  Planning meeting in Costa Mesa, November 19-20, 1998.

Faculty for Workshop on Risk, Risk-Taking, and Lifestyle Change.  Southeast Asian Clinical Epidemiology Network.  Khon Kaen, Thailand, October 10-12, 1998.

Faculty for course on “Physical Activity and Public Health”:  Postgraduate course on research directions and strategies.  University of South Carolina and Centers for Disease Control and Prevention.  Hilton Head, S.C., September 25-28, 1998.

Member of planning committee:  1999 ILSI Conference on Childhood Obesity.  1998-1999.

Scientific Advisory Group.  Cancer Prevention Research Center.  University of Rhode Island.  September 1998.

Member of working group:  Workshop on International Standardization of Physical Activity Assessment for Public Health Purposes.  Sponsored by World Health Organization and Centers for Disease Control and Prevention.  Geneva, Switzerland, April 15-17, 1998.  Orlando, FL, June 5, 1998.

Program Committee.  Physical Activity Interventions, An ACSM Specialty Conference.  Cooper Institute for Aerobics Research.  Dallas, TX, October 19-21, 1997.

Faculty for two courses on “Physical Activity and Public Health”:  Postgraduate course on research directions and strategies; Practitioner’s course on community interventions.  University of South Carolina and Centers for Disease Control and Prevention.  Hilton Head, S.C., September 18-21, 1997.

Member of the Medical/Scientific Advisory Council for the IHRSA Institute on Exercise and Health.  July 1997 - July 1998.

Co-chair (with Stuart Biddle).  Young and Active?  A policy symposium on young people and health-enhancing physical activity.  Health Education Authority of the United Kingdom.  Beaconsfield, England, June 18-20, 1997.

Editorial Committee: Physical Activity and Health: A Report of the Surgeon General. 1994-1996.

Advisory Committee, Improving Child and Adolescent Health Through Physical Activity and Nutrition. International Life Sciences Institute and National Foundation for the Centers for Disease Control and Prevention. 1996-1998.

Special Advisor. California Governor's Council on Physical Fitness and Sports. 1994-1996.

Public Education Committee, American Council on Exercise. 1994-1995.

Chair, International Consensus Conference on Physical Activity Guidelines for Adolescents. La Jolla, CA, June 11-12, 1993.

National Advisory Panel. Guidelines to Promote Physical Activity and Reduce Sedentary Lifestyle as Part of Comprehensive School Health Programs. CDC-Division of School Health and University of South Carolina. 1992-1993.

Member, Priority Expert Panel, "Health Promotion for Children and Adolescents", National Center for Nursing Research. Bethesda, MD, May 13-15, 1992.

Appeared in "Just Move", a 30-minute cable television program on physical activity and health. Produced by Medical Broadcasting Company. Debut May 3, 1992 on Lifetime Medical Television.

Invited testimony to California Senate Health Committee, chaired by Sen. Calderon. Pomona, December 12,1991 and Irvine, March 20, 1992.

Planning Committee, NHLBI Workshop on Physical Activity and Cardiovascular Health: Special Emphasis on Women and Youth. Co-chair of Working Group on Determinants of Physical Activity and Interventions in Youth. Chevy Chase, MD, August 1991.

Keynote Speaker, Australian Behaviour Modification Association. Sydney, July 8, 1991.

Planning Committee, Conference on Behavioral and Sociocultural Perspectives on Ethnicity and Health, sponsored by the Division Health Psychology (38) of the American Psychological Association, 1991-1992.

Conference Co-coordinator (with John E. Martin, Ph.D.). How to "Just Do It": Motivating People to Exercise in the 1990s. San Diego, January 25-26, 1991.

Authored Chapter 8, "Methods for Changing Health Behaviors" for the 4th edition of the Guidelines for Exercise Testing and Prescription . American College of Sports Medicine, 1991, pp. 187-199.

Scientific Advisory Board, FITNESSGRAM Program. Institute for Aerobics Research, Dallas, Texas, 1988-Present.

Member, Southwestern Urban Area Health Education Council Advisory Board, 1987-1989.

Member, Maternal, Child and Adolescent Health Board, County of San Diego, 1987-1993.

Participant and presentor, American Heart Association Ten-Day Seminar on Epidemiology and Prevention of Cardiovascular Diseases, August 1-13, 1982, Lake Tahoe, CA.