He is the Coordinator of DIVERCITIES. His research focuses on urban policy, residential segregation, and neighbourhood choice. He is the editor of the Journal of Housing and the Built Environment. He has been guest (co-)editor of four recent special issues closely linked to the subject of this project: Combating residential segregation of ethnic minorities (Journal of Housing and the Built Environment 2009), Housing policy and (de)segregation: An international perspective (Housing Studies 2010), Linking integration and residential segregation (Journal of Ethnic and Migration Studies 2010), Mixing Neighbourhoods: Success or Failure? (Cities, 2013).