Publications

Monographs

• The Hidden Virtues of Discretionary Power in European Migration Law, Hart, Oxford (forthcoming).

Journal Articles

• Temporal Governance and the Production of Precarity in the New Pact on Migration and Asylum. In: European Public Law (together with Francesco Maiani) (forthcoming).

• Discretionary powers - an (often overlooked) focalization point of the rule of law crisis. In: Revue des Affaires Européennes (forthcoming).

• Competing Visions and Constitutional Limits of Schengen Reform: Securitization, Gradual Supranationalization and the Undoing of Schengen as an Identity-Creating Project. In: German Law Journal (forthcoming)

• Of autocratic incrementalism and inadvertant inspirations: the interaction between the European Court of Justice and national lawmakers in the rule of law crisis in Poland. In: European Law Open, 2023, Vol. 2, 302-321 .

• Judicial responses to autocratic legalism – the European Court of Justice in a cleft stick? European Papers. In: European Papers, 2022, Vol. 7, Nr. 2, 651-670.

• Schengen and Free Movement Law during the First Phase of the COVID-19 Pandemic: of Symbolism, Law and Politics. In: European Papers, 2020, Vol. 5, 1143-1170 (together with Daniel Thym).

• The Role of Member State Governments in Migration Litigation before the ECJ. In: European Journal of Migration and Law, 2020, Vol. 22, 541-570.

• The Guises of and Guidance to Administrative Discretion in the European Court of Justice’s Interpretation of EU Immigration Law. In: Review of European Administrative Law, 2019, Vol. 12, 97-126. 

• Mitgliedstaatliche Gestaltungsspielräume im Schengener Grenzkodex – Folgen für einen Raum ohne Kontrollen an Binnengrenzen. In: integration 3/2018, 194-209.

Contributions to Edited Volumes

• Migration Policy - Between Crisis Preparedness, Ad Hoc Solutions and Administrative Capacity Building. In: Fromage, Diane; Héritier Adrienne; Weismann, Paul (eds.): EU Regulatory Responses to Crises, OUP (forthcoming) (together with Daniel Thym).

• Zur Legitimität und Legitimierung von Ungleichbehandlungen im Migrationsrecht. In: Thym, Daniel (ed.): Deutschland als Einwanderungsland, Mohr Siebeck, 113-136 (forthcoming).

• Informal coordination and inter-crises learning - external travel bans during the Covid crisis and the war in Ukraine. In: De Bruycker et al. (eds), The Law of Schengen. Limits, Contents and Perspectives after 40 Years, Larcier (forthcoming).

• Of coordinated approaches and fair-weather arrangements: the EU crisis response to Covid-19 mobility restrictions. In: Brodowski, Dominik; Weber, Florian; Nesselhauf, Jonas (Eds.), Pandemisches Virus – nationales Handeln: “Covid 19” und die europäische Idee, Springer 2023, 87-108.

• Binnenmarktrechtliche Grundlagen des Infektions- und Gesundheitsschutzrechts. In: Huster, Stefan; Kingreen, Thorsten (Eds.), Handbuch Infektionsschutzrecht, 2nd ed., 2022 (together with Daniel Thym).

• Family Reunification Directive 2003/86/EC. In: Thym, Daniel; Hailbronner, Kay (Eds.), EU Immigration and Asylum Law Commentary, 3rd ed., 2022 (together with Carolin Arévalo; Tobias Klarmann).

• Binnenmarktrechtliche Grundlagen des Infektions- und Gesundheitsschutzrechts. In: Huster, Stefan; Kingreen, Thorsten (Eds.), Handbuch Infektionsschutzrecht, 2021, Beck, 65-90 (together with Daniel Thym).

• The Civil Judge as Administrator of Return Detention: The Case of Germany. In: Moraru, Madalina; Cornelisse, Galina; De Bruycker, Philippe (Eds.), Law and Judicial Dialogue on the Return of Irregular Migrants from the European Union, 2020, Hart, 213-236 (together with Harald Dörig).

• Grenzschutzpolitik. In: Weidenfeld, Werner; Wessels, Wolfgang; Tekin, Funda (Eds.), Europa von A bis Z 15-17th ed., Springer VS, Wiesbaden, 2020/2022/2024.

Blog posts

• Testing the Inspirational Link between EU Citizenship and Migration Law: C-112/22 and C-223/22 CU and ND on Indirect Discrimination of Long-Term Residents. In: European Law Blog, 2nd September 2024.

• Could Hungary be suspended from Schengen? 'National Cards' for Russian and Belarussian Natioanls as a Geopolitical Threat. In: Verfassungsblog, 8th August 2024.

• Between politics of suspicion and reinforced protection: the EU long-term residence Directive and deportations of ethnic Russians (Case C-752/22, EP). In: EU Law Live, 4th April 2024.

• International Law as a Trailblazer for a Gender-Sensitive Refugee System in the EU. The Court of Justice's ruling in Case C-621/21, Women who are Victims of Domestic Violations. In: European Law Blog, 29th January 2024 (together with Gesa Kübek).

• Discretionary power - a revered instrument in the toolbox of autocrats. In: EU Law Live, Long-read, 16th December 2023.

• The Price of Transatlantic Friendship. Visa-Reciprocity and EU Citizenship at the CJEU. In: Verfassungsblog, 12th September 2023.

• Upgrading the Schengen Information System, degrading the principle of proportionality? In: EU Law Live, Op-Ed, 20th March 2023.

• Heated tempers and legal ambiguities. Some (second) thoughts on an all-out Schengen ban of Russians. In: Verfassungsblog, 17th August 2022.

• The Selective Nature of a pan-European Willkommenskultur. Reflections on the War in Ukraine and Its Implications for Humanitarian Protection. In: Verfassungsblog, 12th July 2022.

• Green light or white flag? The European Commission’s endorsement of the Polish recovery plan and its implications for the rule of law crisis. In: European Law Blog, 8th June 2022.

• Reviving the Promise of Schengen. The Court of Justice’s Judgment in Landespolizeidirektion Steiermark on Internal Border Controls. In: Verfassungsblog, 28th April 2022.

• The Commission’s proposed reform of the Schengen area – stronger enforcement or conflict aversion? In: EU Law Enforcement, 31st January 2022.

• Stand-by duties in the Working Time Directive: Window-dressing workers’ rights? In: European Law Blog, 22nd March 2021.

• Academic freedom in illiberal times – A bittersweet victory for the Central European University. In: European Law Blog, 21st October 2020.

• Coming to terms with the refugee relocation mechanism. In: European Law Blog, 14th April 2020. Re-published as: Coming to terms with relocation: the infringement case against Poland, Hungary and the Czech Republic. In: EU Immigration and Asylum Law and Policy, 17th April 2020.

• Threats to public security in EU immigration law: Finding the right discretion. In: European Law Blog, 6th January 2020.

• Joining Schengen – Cutting a Gordian knot for Romania and Bulgaria? In: EU Immigration and Asylum Law and Policy, 26th April 2018.