Andreas Müller is a Research Officer at the Federal Office for Migration and Refugees (BAMF), Germany. His research interests include the political sociology of Europe and the nation state.

• 1. Introduction 2. Post-national Borders as Functions or Institutions: A Theoretical Framework 3. The EU and the Transformations of Borders 4. Methods and Research Design 5. Maintaining Internal Freedom of Movement: The European Commission's Perspective on the external EU- Borders 6. Enforcing Selective Migration Policies: Germany and the External EU-Borders 7. Promoting Open Borders: Poland and the Visa Obligation 8. The institutionalization of the EU's border Regime between Poland and Ukraine 9. Conclusion

"This book is a timely contribution to the discussion about the institutionalization of the EU's external borders and the preferences and views of three sets of actors - the European Commission, the Member States and non-EU countries - on this border. ... This book makes for interesting reading for all those studying the politics of the EU's external borders." (Natasja Reslow, Journal of Common Market Studies, Vol. 54 (2), 2016)