His research focuses on the intented and unintended consequences of the regulation of international migration (illegal migration, immigration detention and deportation, 'assisted voluntary return', crime among first and second generation immigrants). Additionally, he has published on immigrant integration, transnationalism, and neighbourhood saferty. His work been published in migration journals, and in more general sociological, criminological and urban studies journals. In 2009 Amsterdam University Press published his dissertation Illegal Residence and Public Safety in the Netherlands.