Robert Manning is Professor in the Rubenstein School of Environment and Natural Resources at the University of Vermont, where he teaches the history, philosophy, and management of parks and related areas and conducts a program of research for the U.S. National Park Service and related agencies. He is also Director of the university's Park Studies Laboratory. Dr. Manning has spent four year-long sabbatical leaves with the U.S. National Park Service at Grand Canyon National Park, Yosemite National Park, Golden Gate National Recreation Area, and the headquarters office in Washington, DC. He is the author of several books, including Studies in Outdoor Recreation: Search and Research for Satisfaction (2nd Edition) (Oregon State University Press), Parks and Carrying Capacity: Commons without Tragedy (Island Press), and Parks and People: Managing Outdoor Recreation at Acadia National Park (University Press of New England).