David Ley is Canada Research Chair of Geography at the University of British Columbia in Vancouver. His research examines the social geography of gateway cities, including relations between immigration and urbanisation, and gentrification and housing markets. He is the author of The New Middle Class and the Remaking of the Central City  (1996), and A Social Geography of the City (1983), co-author of Neighbourhood Organizations and the Welfare State (1994), and co-editor of Place/Culture/Representation (1993). He is a Fellow of the Royal Society of Canada and of the Pierre Trudeau Foundation.