Guy S. Parcel, Ph.D., is M. David Low Chair in Public Health and John P. McGovern Professor in Health Promotion, The University of Texas at Austin, and an investigator in the Center for Health Promotion and Prevention, University of Texas Health Science Center at Houston, School of Public Health.

Gerjo Kok, Ph.D., is dean, faculty of psychology, and professor in applied psychology, The University of Maastricht, The Netherlands.

Nell H. Gottlieb, Ph.D., is professor, behavioral sciences, Center for Health Promotion, University of Texas Health Science Center at Houston, School of Public Health.