For many years, he has dealt with trends and political developments in the field of migration, refuge and asylum, particularly in Germany and in Europe. He is the author of numerous publications on the subject. His roles currently include work as a consultant at UNHCR Germany and lecturer at the Humboldt University in Berlin. He is also an author and lecturer for various organisations and media. He is a member of both the editorial team of a blog devoted to research on refugees, and also a member of the Migration in Europa network. From 2013 to 2015, he was a research associate at the Council of Experts (Sachverständigenrat, SVR) of German foundations for integration and migration.