Ross C. Brownson, Ph.D. is Professor of Epidemiology, Co-Director, Prevention Research Center in St. Louis, George Warren Brown School of Social Work, Department of Surgery and Siteman Cancer Center, Washington University School of Medicine, St. Louis. Elizabeth A. Baker, Ph.D., M.P.H. is Director, Division of Behavioral Science and Health Education, School of Public Health, St. Louis University. Terry L. Leet, Ph.D. (1952-2009), was Assistant Professor of Epidemiology, Saint Louis University Kathleen N. Gillespie, Ph.D., is Associate Professor of Health Management, St. Louis University School of Public Health, St. Louis. William R. True, Ph.D., M.P.H. is Research Professor, George Warren Brown School of Social Work, Washington University in St. Louis.