Noel Castree is Professor of Geography at Manchester University, England, and the University of Wollongong, Australia. Editor of Social Nature (2001) and author of Making Sense of Nature (2013), his current research focuses on how people and Earth are represented by expert communities cross the disciplines.

David Demeritt is a Reader in Geography at King's College, London. He has published many essays on the politics and practice of environmental science and theories of society?nature relations more generally.

Diana Liverman is Co-Director of the Institute of the Environment and Regents Professor of Geography and Development at the University of Arizona. She has published widely on environmental change and policy.

Bruce Rhoads is Professor and Chair of the Department of Geography, University of Illinois at Urbana-Champaign, and is primarily interested in the fluvial dynamics of streams.