Aldo Leopold, Andrew Kernohan, Anne Ehrlich, Aristotle, Arne Naess, Bill Devall, Brian J. Walsh, Bron Taylor, Bryan Norton, Calvin DeWitt, Carl Cohen, David Clowney, David DeGrazia, David Ehrenfeld, Deane Curtin, Ed McGaa, Ernest Partridge, Erroll Schweizer, Erv Peterson, Eugene Hargrove, Francis of Assisi, Garrett Hardin, George Sessions, Herman Daly, Holmes Rolston III, Immanuel Kant, Joachim Blatter, John Hasse, John O'Neil, Juan Martinez-Alier, Karen Warren, Katie McShane, Kauser Jahan, Kenneth Kraft, Kristin Schrader-Frechette, Lily-Marlene Russow, Lynn White, Majora Carter, Marianne B. Karsh, Mark Sagoff, Marti Kheel, Maya Brennan, Michael Nelson, Miriam MacGillis, Murray Bookchin, Nik Ansell, Nuria Fernandez, Patricia Mosto, Paul, Paul Steidlmeier, Paul Taylor, Peter Singer, Peter Warshall, Peter Wenz, Philip J. Bentley, Philip Nyhus, Po-Keung Ip, Ralf Isenmann, Ramachandra Guha, Ray Anderson, Rene Descartes, Richard Sylvan, Robert Elliot, Roberto Mechoso, Roger Thompson, Seyyed Hossein Nasr, Spencer Abraham, Stephen Gardiner, Stephen Pacala, Stephen Socolow, Stuart Ewen, Thomas Aquinas, Tom Regan, Vandana Shiva, William Baxter
