Ian Douglas is Emeritus Professor of Physical Geography at the University of Manchester, UK.

P M L Anderson is a lecturer and director of graduate studies in the Department of Environmental and Geographical Science and urban ecology researcher at the African Centre for Cities, University of Cape Town, South Africa.

David Goode is an ecologist and naturalist, formerly Head of Environment at the Greater London Authority, and now Honorary Professor at University College, London, UK.

Michael C. Houck is The Urban Naturalist of the Urban Greenspaces Institute, Portland, OR, USA.

David Maddox is the Founder and Editor of The Nature of Cities, New York, USA (www.thenatureofcities.com).

Harini Nagendra is Professor of Sustainability at Azim Premji University, India.

Tan Puay Yok is an Associate Professor at the National University of Singapore, Singapore.