The overarching theme of his research is the interaction of migration with labour markets, public services, and health outcomes, with a key focus on the role of policy in affecting those interactions. An important contribution of his work has been the application of concepts from economics to conceptualise migration decisions and the impacts of migration on host communities in the forced migration context. Bringing additional insights from other social sciences, he has developed conceptual frameworks and methodological approaches to investigate the evidence in this context.