Daniel H. Deudney is Professor of Political Science (Johns Hopkins University). He has published extensively on international theory, world political theory and contemporary global/planetary issues (environment, space, and nuclear). He has also written extensively with G. John Ikenberry on the liberal international order and the end of the Cold War. His book, Bounding Power: Republican Security Theory from the Polis to the Global Village (Princeton, 2007) received the Book of the Decade Award (2000–2009) from the International Studies Association. His most recent book is Dark Skies: Space Expansionism, Planetary Geopolitics and the Ends of Humanity (Oxford, 2020).