Justus Uitermark is Professor of Urban Geography at the University of Amsterdam and also is affiliated with the Sociology Department at the same university. He has many research interests but mostly studies politics and cities. As a relational sociologist, Uitermark focuses on networks: what sorts of networks do people form to resolve their collective problems and achieve their goals vis-à-vis others? With a background in human geography, he is particularly interested how different kinds of environments mediate collective action. His books include Dynamics of Power in Dutch Integration Politics and Cities and Social Movements (co-authored with Walter Nicholls).