Brian O’Neill is a Professor at the Josef Korbel School of International Studies at the University of Denver. He also serves as Director of Research at the Korbel School’s Pardee Center for International Futures. Brian holds a Ph.D. in Earth Systems Science and an M.S. in Applied Science, both from New York University. His research interests are in human-environment interactions, in particular the relationship between future societal development, greenhouse gas emissions, and climate change impacts. He has led research groups on Integrated Assessment Modeling and on Climate and Human Systems at the US National Center for Atmospheric Research (NCAR), and on Population and Climate Change at the International Institute for Applied Systems Analysis (IIASA). Brian is a Convening Lead Author for the Intergovernmental Panel on Climate Change’s ongoing Sixth Assessment Report. He is also the lead author of Population and Climate Change, published by Cambridge University Press.