For the past three decades, Geoff has focused on the links among environment, peace, and security. Through collaborative applied research, policy dialogue facilitation, and policy advising, Geoff has had the good fortune to collaborate with many of the leading scholars and practitioners in the United States and around the world. His time working at the Council on Foreign Relations, University of Maryland, Woodrow Wilson Center, and now Ohio University have enabled him to engage with the pressing questions as the topics evolved from redefining security, environment and conflict, environmental peacebuilding, and climate and security. Long-time partners at U.S. Agency for International Development, the UN Environment Programme, adelphi research in Berlin, Duke University, University of Maryland, University of California, Irvine, University of Massachsetts, Boston, University of Melbourne, Uppsala University, the U.S. Army War College, International Peace Park Expeditions, the Environmental Law Institute, and others have made this work fundamentally collaborative. Here are some highlights of some of that work.