Philip Cafaro is professor of philosophy at Colorado State University in Fort Collins, Colorado, and an affiliated faculty member of CSU’s School of Global Environmental Sustainability. He holds degrees in philosophy and history from the University of Chicago, the University of Georgia, and Boston University. A former ranger with the U.S. National Park Service and a life member of the Sierra Club, Cafaro’s main research interests are in environmental ethics, population and consumption issues, and wild lands preservation. He is the author of Thoreau's Living Ethics: Walden and the Pursuit of Virtue and co-editor of the anthology Life on the Brink: Environmentalists Confront Overpopulation, both from University of Georgia Press, and author of How Many Is Too Many? The Progressive Argument for Reducing Immigration into the United States (University of Chicago Press).
- The Overpopulation Project, University of Gothenburg, Sweden (co-principle investigator)
- The Concord Saunterer, journal of the Thoreau Society (advisory board)
- International Society of Environmental Ethics (past president)