Welcome! I'm a philosophy professor at Colorado State University in Fort Collins, Colorado. My main research interests center on environmental ethics, consumption and population issues, and wild lands preservation. I'm the author of How Many Is Too Many? The Progressive Argument for Reducing Immigration into the United States, published by University of Chicago Press, and author of Thoreau's Living Ethics and co-editor of the anthology Life on the Brink: Environmentalists Confront Overpopulationboth published by University of Georgia Press. I am an affiliated faculty member of CSU’s School of Global Environmental Sustainability and president of the International Society for Environmental Ethics. I live in Fort Collins with my wife Kris and sons Henry and Tom.