Andrew S. Goudie is an Emeritus Professor of Geography at the University of Oxford. He specialises in the study of desert processes and climate change, and has worked in the Middle East, India and Pakistan, East Africa, Southern Africa, Australia, and the USA. From 2005 to 2009, Professor Goudie was President of the International Association of Geomorphologists and he has also been President of the Geographical Association, President of Section E of the British Association, and Chairman of the British Geomorphological Research Group. He was the recipient of the Farouk El-Baz Prize for Desert Research from the Geological Society of America in 2007 and the Founder's Medal of the Royal Geographical Society in 1991. Heather Viles is Professor of Biogeomorphology and Heritage Conservation at the University of Oxford. Her research focuses on understanding weathering and rock breakdown in coastal, arid, and urban environments, and applying that knowledge to conserving heritage sites. She also works extensively on the links between geomorphology and ecology. Professor Viles has been Chairman of the British Society for Geomorphologists, Vice President (fieldwork) of the Royal Geographical Society, and is currently on the executive committee of the International Association of Geomorphologists. She received the Ralph Alger Bagnold Medal from the European Geosciences Union in 2015 for establishing the field of biogeomorphology.