Professor Katja Ziegler

• Sir Robert Jennings Chair of International Law and a Director of the Centre for European Law and Internationalisation (CELI) since 2012.
• Visiting Research Fellow at the Institute of European and Comparative Law at the University of Oxford.
• Qualified Rechtsanwältin (Barrister-Solicitor) and Member of the Bar of Düsseldorf, Germany.
• Before joining the University of Leicester, I was Lecturer, and from 2008 Reader in European and Comparative Law and Fellow in Law of St Hilda’s College at the University of Oxford (2002-12) and lecturer at the University of Bielefeld, Germany (1995-2001). I also practiced law in the Brussels office of the international law firm Hengeler Mueller (2001-2002). 

My research spans international European and comparative law.

Themes include

• the constitutionalization and interaction of legal orders, in particular in the area of human rights and through general principles of law
• Brexit and EU-UK relations law
• limits on executive power to resort to military force from comparative constitutional law and international law perspectives

Books

Monograph

• Fluchtverursachung als völkerrechtliches Delikt. Die völkerrechtliche Verantwortlichkeit des Herkunftsstaates für die Verursachung von Fluchtbewegungen [‘Causing Refugee Flows as a Delict under Public International Law. State Responsibility of the State of Origin for the Causation of Refugee Flows’] (Duncker & Humblot, Berlin 2002)

Edited Books

• Research Handbook on General Principles in EU Law: Constructing Legal Orders in Europe (Edward Elgar, Research Handbook (Cheltenham, Edward Elgar 2022, with PJ Neuvonen and V Moreno-Lax).
• The UK and European Human Rights – A Strained Relationship? (Oxford, Hart Publishing 2015, with E Wicks and L Hodson).
• Current Problems in the Protection of Human Rights in Germany and the UK (Oxford, Hart Publishing 2013, with PM Huber).
• Englisches Handels- und Wirtschaftsrecht [English Commercial and Economic Law] (Frankfurt, Recht und Wirtschaft 2012, with V Triebel, M Illmer, W-G Ringe and S Vogenauer).
• Constitutionalism and the Role of Parliaments (Oxford, Hart Publishing 2007) (with Denis Baranger, Anthony W. Bradley).
• Human Rights and Private Law: Privacy as Autonomy (Oxford, Hart Publishing 2007). 
  
   
  
  
  

Articles and Chapters

2024

• ‘Wettbewerbsrecht’ [English Competition Law], in S Vogenauer (ed), Englisches Handels- und Wirtschaftsrecht[English Commercial and Economic Law] (4th edn, CH Beck, Munich 2024), chapter 9, 365-463 (with Florian Wagner-von Papp).
• ‘The Paradigm Shift from EU Law to International Law of the Trade and Cooperation Agreement: A Swansong’, in J Adams-Prassl, Sanja Bogojevic, A Ezrachi and D Leczykiewicz (eds), The Internal Market Ideal – Essays in Honour of Stephen Weatherill (Oxford University Press 2024), Chapter 16, 339-363.

2022

• ‘The Second Attempt at EU Accession to the ECHR: Opinion 2/13’, in Graham Butler and Ramses A. Wessel (eds), EU External Relations Law: The Cases in Context (Hart Publishing forthcoming June 2022) 755-773, pre-print version on SSRN).
• ‘General Principles in the EU Legal Order: Past, Present and Future Directions’, in Katja S. Ziegler, Päivi J. Neuvonen and Violeta Moreno-Lax (eds), Research Handbook on General Principles in EU Law: Constructing Legal Orders in Europe (Edward Elgar 2022), 7-24 (with Päivi Neuvonen). 
• ‘Autonomy of the EU Legal Order - A General Principle? On the Risks of Normative Functionalism and Selective Constitutionalisation’, in Katja S. Ziegler, Päivi J. Neuvonen and Violeta Moreno-Lax (eds), Research Handbook on General Principles in EU Law: Constructing Legal Orders in Europe (Edward Elgar 2022), 227-252 (with Violeta Moreno-Lax), also EUI Working paper (LAW 2021/15).
• ‘Human Rights and General Principles: Beyond the EU Charter of Fundamental Rights’, in Katja S. Ziegler, Päivi J. Neuvonen and Violeta Moreno-Lax (eds), Research Handbook on General Principles in EU Law: Constructing Legal Orders in Europe (Edward Elgar 2022), 327-348 (with Aristi Volou).
• ‘Beziehungen zwischen EU und UK nach dem Brexit’ in Andreas von Arnauld und Marc Bungenberg (eds), Europäische Außenbeziehungen, Enzyklopädie des Europarechts, Vol. 12 (2nd edn, Baden-Baden, Nomos 2022), 501-554.

2020

• ‘Rechtliche und politische Herausforderungen des Brexit für das Vereinigte Königreich: Die Rolle des Parlaments im Brexit-Verfahren’ [Legal and Political Challenges of Brexit for the United Kingdom], in Markus Ludwigs und Stefanie Schmahl (eds), Die EU zwischen Niedergang und Neugründung - Wege aus der Polykrise [The EU between Decline and Renaissance] (Baden-Baden, Nomos 2020) 127-175. (pre-print version on SSRN).
• ‘Der Brexit. Zu Ursachen, Austrittsverfahren und Perspektiven’[Brexit: Causes, Procedure and Perspectives], in Arnd Uhle (ed), Quo vadis Europa? – Gegenwarts- und Zukunftsfragen der europäischen Einigung (Berlin, Duncker & Humblot 2020) 77-164. (pre-print version on SSRN).

2019

• ‘The Use of Force by the United Kingdom: Evolution of Accountability’, in Curtis Bradley (ed), Oxford Handbook of Comparative Foreign Relations Law (Oxford University Press 2019) 771-789.
• ‘AWACS I (Ger)’, in R Grote, R Wolfrum and F Lachenmann (eds), Max Planck Encyclopedia of Comparative Constitutional Law (MPECCoL 2019).

2017

• ‘Autonomy: From Myth to Reality – or Hubris on a Tightrope? EU Law, Human Rights and International Law’, in Sionaidh Douglas-Scott and Nicholas Hatzis (eds) Research Handbook on EU Human Rights Law (Cheltenham, Edward Elgar 2017), Chapter 12, 267-307.
• ‘Immunity v Human Rights: The Right to a Remedy after Benkharbouche’, (2017) 17 Human Rights Law Review 127-151.

2016

• ‘Beyond Pluralism and Autonomy: Systemic Harmonisation as a Paradigm for the Interaction of EU Law and International Law’ (2016) 35 Yearbook of European Law 667-711.
• ‘The Relationship between EU law and International Law’, in Dennis Patterson and Anna Södersten (eds), Blackwell Companion for European Union Law and International Law (Hoboken, NJ, Wiley-Blackwell 2016), 42-61.

2015

• ‘The UK and European Human Rights – A Strained Relationship?’ in KS Ziegler, E Wicks and L Hodson (eds), The UK and European Human Rights - A Strained Relationship? (Oxford Hart Publishing 2015), 3-18 (Chapter 1, with E Wicks and L Hodson).
• ‘The UK and European Human Rights: Some Reflections’ in KS Ziegler, E Wicks and L Hodson (eds), The UK and European Human Rights - A Strained Relationship? (Oxford Hart Publishing 2015), 495- 515 (Chapter 25, with E Wicks and L Hodson).

2013

• ‘Introduction: Current Problems in the Protection of Human Rights in Germany and the UK’, in KS Ziegler and PM Huber (eds) Current Problems in the Protection of Human Rights in Germany and the UK (Oxford, Hart Publishing 2013), 1 with PM Huber.

2012

• Entries ‘Domaine Reservé’, o ‘Jay Treaty (1794)’, o ‘Trendtex Trading Corporation v Central Bank of Nigeria’, in Rüdiger Wolfrum (ed), Max Planck Encyclopedia of Public International Law (Oxford, Oxford University Press 2012 and with OUP online).
• ‘Englisches Wettbewerbsrecht‘ [English Competition Law], in V Triebel, M Illmer, W-G Ringe, S Vogenauer and K Ziegler (eds), Englisches Handels- und Wirtschaftsrecht [English Commercial and Economic Law] (Frankfurt, Recht und Wirtschaft 2012), chapter 7, pp. 327-389. 

2011

• The evolution of fundamental rights charters and case law: a comparison of the European and the United Nations systems (together with L Lazarus, N Ghanea, C Costello, European Parliament, Directorate General for Internal Policies 2011, https://www.europarl.europa.eu/thinktank/en/document.html?reference=IPOL-AFCO_ET(2011)432755.
• ‘International Law and EU Law: Between Asymmetric Constitutionalisation and Fragmentation’, in Alexander Orakhelashvili (ed) Research Handbook on the Theory of International Law (Cheltenham, Elgar 2011), chapter 10, pp. 268-327.
• ‘”Abuse of Law” in the Context of Free Movement of Workers’, in Rita de la Feria and Stefan Vogenauer (eds), The Prohibition of Abuse of Law – A New General Principle of EU Law? (Oxford, Hart Publishing 2011), chapter 21, pp. 295-314.

Prior to 2010

• ‘Strengthening the Rule of Law, but Fragmenting International Law: The Kadi Decision of the ECJ from the Perspective of Human Rights’, (2009) 9 Human Rights Law Review  288-305.
• ‘Building a Peoples’ Europe: Political Rights of Foreigners. Freedom of Expression, Assembly and Association and Electoral Rights from the Perspective of EC Law and the ECHR’ in Hartmut Bauer, Pedro Cruz Villalón and Julia Iliopoulos-Strangas  (eds), The ‘New Europeans’: Migration and Integration in Europe  (Baden-Baden/Brussels/Athens, Nomos Verlag/Bruylant/Ant. N. Sakkoulas  2009), pp. 385-424.
• ‘Trendtex Trading Corporation v Central Bank of Nigeria’ in Rüdiger Wolfrum (ed), Max Planck Encyclopedia of Public International Law (Oxford, Oxford University Press 2009).
• ‘Domaine Reservé’ in Rüdiger Wolfrum (ed), Max Planck Encyclopedia of Public International Law (Oxford, Oxford University Press 2008).
• ‘Jay Treaty (1794)’ in Rüdiger Wolfrum (ed), Max Planck Encyclopedia of Public International Law (Oxford, Oxford University Press 2008).
• ‘Patrimonio Culturale e Diritti Umani’, in Centro Internazionale di Studi Gentiliani (ed), Alberico Gentili: La salvaguardia dei beni culturali nel diritto internazionale (Milano, Giuffrè 2008) 511-543. Also published in English ‘Cultural Heritage and Human Rights’ as Oxford Legal Studies Research Paper No. 26/2007 (SSRN).
• ‘Vereinigtes Königreich’, in: Jörg Philipp Terhechte (ed), Internationales Kartell- und Fusionskontrollverfahrensrecht. International Cartel and Merger Enforcement Law, [chapter on UK Competition Law in a comparative-law handbook on competition law] (Bielefeld, Gieseking Verlag 2008) § 13.
• ‘Executive Powers in Foreign Policy: The Decision to Dispatch the Military’ in: Katja S. Ziegler, Denis Baranger, Anthony W. Bradley (eds), Constitutionalism and the Role of Parliaments (Oxford, Hart Publishing 2007) pp. 141-166.
• ‘Constitutionalism and the Role of Parliaments’ in: Katja S. Ziegler, Denis Baranger, Anthony W. Bradley (eds), Constitutionalism and the Role of Parliaments (Oxford, Hart Publishing 2007) pp. 1-13 (together with D Baranger and AW Bradley).
• ‘The Princess and the Press: Privacy after Caroline von Hannover v. Germany’ in: Katja S. Ziegler (ed), Human Rights and Private Law: Privacy as Autonomy (Oxford, Hart Publishing 2007) pp. 189-208.
• ‘Introduction: Human Rights and Private Law: Privacy as Autonomy’ in: Katja S. Ziegler (ed), Human Rights and Private Law: Privacy as Autonomy (Oxford, Hart Publishing 2007) pp. 1-10.
• ‘The Model of a “Parliamentary Army” under the German Constitution’, in: House of Lords Select Committee on the Constitution, Waging War: Parliament’s Role and Responsibility (15th Report of Session 2005-06), Volume II: Evidence (HL Paper 236-II, London, The Stationary Office 2006) pp. 31-46, 56-59.
• ‘The Legal Framework of Trafficking and Smuggling in Germany: Victim Protection Emerging from Witness Protection?’ in: Elspeth Guild, Paul Minderhoud (eds), Immigration and Criminal Law in the European Union: The Legal Measures and Social Consequences of Criminal Law in Member States on Trafficking and Smuggling in Human Beings (Leiden, The Netherlands, Martinus Nijhoff Publishers 2006) pp. 65-111.•
• ‘Grundfreiheiten und soziale Dimensionen des Binnenmarktes – die Verfassung als Impuls?’ [Market Freedoms and Social Dimensions of the Common Market – Impulses from the EU-Constitution?] in: Armin Hatje & Jörg Philipp Terhechte (eds), Das Binnenmarktziel in der europäischen Verfassung, Europarecht 2004 (Special Issue), pp. 13–39.
• ‘Integration und Ausgrenzung im Lichte der Migrationspolitik der Europäischen Union – die “Festung Europa“?’ [‘Integration and Exclusion in the Light of the Migration Policy of the European Union – “Fortress Europe”’?], in: Konrad Sahlfeld, Martina Caroni, Anna Chudozilov (eds), Integration und Recht (München, Beck Verlag 2003) pp. 127-179.
• ‘Der Volksbegriff des Grundgesetzes: Ist die Position des Bundesverfassungsgerichts alternativenlos?’ in: Ulrike Davy (ed), Politische Integration der ausländischen Wohnbevölkerung (Baden-Baden, Nomos 1999) pp. 222 - 247 [‘The meaning of the term “people” in the German Constitution and the position of the German Constitutional Court’, together with Christoph Gusy].
• ‘Regelungsmöglichkeiten für eine europäische Einwanderungsgesetzgebung’ in: Albrecht Weber (ed), Einwanderungsland Bundesrepublik Deutschland in der Europäischen Union: Gestaltungsauftrag und Regelungsmöglichkeiten (Osnabrück 1997) pp. 331 – 343 [‘Options for a European Immigration Legislation’, together with Christoph Gusy].
• ‘Menschenrechtsfragen elektronischer Personenüberwachung’ (1996) Journal für Rechtspolitik 193 - 206 [‘Human Rights Questions of Electronic Surveillance’, together with Christoph Gusy].

I welcome PhD proposals in the general areas of

• Public international law
• Human rights law, in particular, European human rights (European Convention on Human Rights, EU Charter of Fundamental Rights, their interaction)
• EU law
• Comparative constitutional law and comparative human rights law

I have particular interest in the following themes: 

• Interaction of legal orders
• Brexit
• International law in national legal orders
• Constitutionalisation of legal orders
• EU Foreign relations law
• General principles of law
• Accountability for the use of force in international law, national law and comparative perspectives

• Member of the editorial board of International and Comparative Law Quarterly (ICLQ)
• Member of the Advisory Board of the Max Planck Encyclopaedia of Comparative Constitutional Law (MPECCoL)
• Member of the Advisory Board of the research strand and book series 'Global Europe' (Asser Institute The Hague Netherlands; TMC Asser Press/Springer)
• Member of the Advisory Board of the Journal European Public Law
• AHRC-ESRC-FCDO Knowledge Exchange Fellow 2021-22
• Advised European Parliament, Council of Europe
• Expert witness to the House of Lords’ Constitution Committee in its inquiry on war-making powers of the Government

My held grants from UK and EU funders:

• Arts and Humanities Research Council: AHRC-FCDO Knowledge Exchange Fellowship: secondment to the Foreign Commonwealth and Development Office (2021-22)
• European Commission (Jean Monnet Project): Constructing Legal Orders in Europe: General Principles in  EU Law (2017-2021)
• British Academy: Law Across Boundaries: The General Principles of EU Law (2016-18)
• British Academy Mid-career Fellowship: Judicialising War: International Use of Force in National Courts (2014-15)
• European Commission (DG Justice): CharterClick! project, developing a toolkit on the EU Charter of Fundamental Rights (2015-17)

• Doctor iuris (Dr. iur.), Bielefeld University 2001
• Second State Examination in Law, Düsseldorf 2001
• First State Examination in Law, Cologne 1995 & Law degree, Bonn University, Germany
• Rechtsanwältin (Barrister-Solicitor) and Member of the Bar at Düsseldorf, Germany