Sam Halvorsen is a Reader in the School of Geography at Queen Mary University of London. His research examines the role of territory in grassroots politics and, more broadly, political participation and democracy in Latin America cities. He has published widely in journals such as Progress in Human Geography, Transactions of the Institute of British Geographies and the Annals of the American Association of Geographers. He is founder and chair of the Latin American Geographies Research Group of the Royal Geographical Society. He is currently editorial board member of Transactions of the Institute of British Geographers and Punto Sur and sits on the international editorial boards of Antipode: A Radical Journal of Geography, Journal of Latin American Geography and Third World Quarterly.