Graham Clarke is Professor of Business Geography at the University of Leeds and was the 2016-2017 ERG Visitting Scholar. He has worked extensively in various areas of GIS and applied spatial modelling, focusing on many applications within urban/social geography. A major research interest has been spatial modelling, especially spatial interaction modelling and microsimulation (especially for estimating small-area patterns of income and wealth, and in applications relating to retail, crime and health). Graham has also been very active in retail geography and model development in relation to retail store location planning. His major research interests relate to retail location planning in relation to the multi-channel growth strategies of retail organisations. This includes work on food deserts, retail saturation, e-commerce, the growth of discounters and convenience retailing.