R. Bruce Hull is a Senior Fellow at the Center for Leadership in Global Sustainability at Virginia Tech, which provides graduate education and professional development opportunities for sustainability professionals working at the intersection of business, government, and civil society. He has authored and edited numerous publications, including two books, Infinite Nature (University of Chicago Press) and Restoring Nature (Island Press). Michael Mortimer is Founding Director and Senior Fellow at the Center for Leadership in Global Sustainability at Virginia Tech. Dr. Mortimer works with professionals and students on sustainable development questions in locations around the world, and his most active research and writing is centered on the role that global cities can play in leading and solving sustainable development challenges. David Robertson is Founding Director of the Executive Master of Natural Resources graduate degree program and Senior Fellow at the Center for Leadership in Global Sustainability, Virginia Tech. Dr. Robertson is also a founder and principal of Educene, a travel education, upskilling, consulting firm.