Ann P. Kinzig,¹ Paul R. Ehrlich,² Lee J. Alston,³ Kenneth Arrow,⁴ Scott Barrett,⁵ Timothy G. Buchman,⁶ Gretchen C. Daily,⁷ Bruce Levin,⁸ Simon Levin,⁹ Michael Oppenheimer,¹⁰ Elinor Ostrom,¹¹ Donald Saari<sup>12

1</sup>Ann P. Kinzig ( ) is a professor in the School of Life Sciences at Arizona State University, in Tempe. ann.kinzig@asu.edu
²Paul R. Ehrlich is the Bing Professor of Population Studies in the Department of Biology at Stanford University, in Stanford, California.
³Lee J. Alston is a professor of economics and environmental studies at the University of Colorado at Boulder.
⁴Kenneth Arrow is the Joan Kenney Professor of Economics and a professor of operations research in the Department of Economics at Stanford University, in Stanford, California.
⁵Scott Barrett is the Lenfest—Earth Institute Professor of Natural Resource Economics in the School of International and Public Affairs at Columbia University, in New York, New York.
⁶Timothy G. Buchman is a professor of surgery and anesthesiology at the Woodruff Health Science Center in Atlanta, Georgia, and is also affiliated with Emory University, also in Atlanta.
⁷Gretchen C. Daily is the Bing Professor of Environmental Science in the Department of Biology at Stanford University, in Stanford, California.
⁸Bruce Levin is the Samuel Candler Dobbs Professor of Biology in the Department of Biology at Emory University, in Atlanta, Georgia.
⁹Simon Levin is the Moffett Professor of Biology in the Department of Ecology and Evolution at Princeton University, in Princeton, New Jersey.
¹⁰Michael Oppenheimer is the Albert G. Milbank Professor of Geosciences and International Affairs in the Department of Geosciences and the Woodrow Wilson School of Public and International Affairs at Princeton University, in Princeton, New Jersey.
¹¹The late Elinor Ostrom was a distinguished professor and the Arthur F. Bentley Professor of Political Science in the Department of Political Science at Indiana University, in Bloomington, at the time of this article's preparation.
¹²Donald Saari is a University of California, Irvine, Distinguished Professor, Mathematics and Economics, at the Institute for Mathematical Behavioral Sciences at the University of California, Irvine.