J. Morgan Grove is team leader and research scientist at the Baltimore Field Station, USDA Forest Service.Mary L. Cadenasso is professor and ecologist, Department of Plant Sciences, University of California, Davis.Steward T. A. Pickett is Distinguished Senior Scientist, Cary Institute of Ecosystem Studies, Millbrook, N.Y.Gary E. Machlis is Professor of Environmental Sustainability at Clemson University, and Science Advisor to the Director, National Park Service.William R. Burch, Jr. is Hixon Professor Emeritus of natural resource management and senior research scientist, Yale University School of Forestry and Environmental Studies.