Andrew Dannenberg, M.D., M.P.H., serves as a consultant to and formerly was Team Leader of the Healthy Community Design Initiative in the National Center for Environmental Health at the Centers for Disease Control and Prevention (CDC). He holds affiliate faculty appointments in the Department of Environmental and Occupational Health Sciences and in the Department of Urban Design and Planning at the University of Washington in Seattle. Howard Frumkin, M.D., Dr.P.H., is Dean of the School of Public Health at the University of Washington. He previously served as Director of the National Center for Environmental Health/Agency for Toxic Substances and Disease Registry at CDC, where he established programs in climate change and in the built environment. He is co-author ofUrban Sprawl and Public Health(Island Press, 2004). Richard Jackson, M.D., M.P.H., is Professor and Chair of the Department of Environmental Health Sciences at the University of California, Los Angeles. He is a pediatrician, and previously served as director of the National Center for Environmental Health at CDC and as the State Public Health Officer for California. He is co-author ofUrban Sprawl and Public Health(Island Press, 2004).