American College of Sports Medicine, 1987-Present; Fellow, 1992.
           Public Information Committee, 1993.
           Pediatric Exercise Committee (ad hoc), 1993-1994.
           Committee on Certification and Education, 1996-1999. 
            Board of Trustees (elected), 1999-2001.

  American Heart Association, Council on Epidemiology, 1981-Present; Fellow, 1992.
            Physical Activity Subcommittee, 1993-1994. 
           Schoolsite Program Task Force, 1994.
           Expert volunteer on behavior change for strategic planning process, 1997.

  American Psychological Association, 1976-Present. 
            Division 38 (Health Psychology).  Fellow, 2000.
           Division 47 (Sport and Exercise Psychology).

American Public Health Association, Public Health Education Section, 1981-Present.

Inter-American Society of Psychologists, 1984-1992.

International Council for Physical Activity and Fitness Research, 1993-Present.
           Board member (elected), 1998-2000.

International Society of Health Psychology, 1996-Present.

San Diego Affiliate, American Heart Association, 1983-Present.

Society of Behavioral Medicine, 1980-Present; Fellow, 1994