Craig R. Allen is leader of the USGS Nebraska Cooperative Fish and Wildlife Research Unit and associate professor in the School of Natural Resources, University of Nebraska. He serves on the board of directors of the Resilience Alliance and the board of editors of the journal Ecology and Society.C. S. Holling has worked at the Institute of Resource Ecology, University of British Columbia, and the International Institute for Applied Systems Analysis in Vienna. He has also held the Arthur R. Marshall Jr. Chair in Ecological Sciences at the University of Florida, where he launched a comparative study of the structure and dynamics of ecosystems in the Florida Everglades. He is a coeditor of Columbia University Press“s Barriers and Bridges to the Renewal of Regional Ecosystems.