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Jannika Jahn

Dr. iur. (LL.B. London), Senior Research Fellow
Tel. +49 (6221) 482-265

Main Fields of Research:

European and international human rights law; business and human rights law; international environmental law; comparative constitutional law and theory; interdisciplinary analysis of law

Academic Career:

2021-2023: Advising expert for the Consultative Council of European Judges (CCJE) of the Council of Europe regarding Opinion No. 25 (2022) on the topic of "Freedom of Expression of Judges and the Duty of Judicial Independence" (2021-2022); Presentation of the opinion and discussion with the Ukrainian judiciary (2023)

2021-present: Associate Fellow at Maastricht University (Globalization and Law Network

2020-present: Senior Research Fellow at the Max Planck Institute for Comparative Law and Public International Law

2019-present: Associate editor at the Verfassungsblog for International Law and Human Rights Protection

2019-2020: Lawyer at Freshfields Bruckhaus Deringer in Berlin in public commercial law (with Prof. Dr. Kaufmann)

2016-2018: Legal clerkship (Kammergericht Berlin), with stations at the Federal Ministry for Economic Affairs and Energy (unit: Legal representation of Germany before the European Courts) and the European Court of Justice (cabinet: Judge Prof. Dr. von Danwitz)

2011-2016: Research Fellow at the Max Planck Institute for Comparative Law and Public International Law with Prof. Anja Seibert-Fohr in the Research Group of "Judicial Independence in Multi-Level Governance" (June 2011 - June 2013), subsequently with Prof. Anne Peters, with a dissertation project on "The media publicity of the judiciary and its limits" (summa cum laude).

2008 - 2011: Student Research Fellow at the Institute of Comparative Public Law and Public International Law at the University of Cologne

2008 - 2011: Law studies at the University of Cologne (completed with first state's exam)

2004 - 2008: LL.B. English and German Law at University College London (UCL) and University of Cologne (Bachelor thesis: A comparative analysis of specific counter-terrorism measures in England and Germany)

Recent Publications

  • BeckOK LkSG (Commentary to the German Human Rights Due Diligence Law). 1. Aufl.. Beck Verlag, München, 2023. (with Elisabeth Henn)
  • Guest editor for special issue on "Globale Lieferketten im Recht (Global Value Chains in Law)". In: Rechtswissenschaft 4, 455-652 (2022).
  • Einführung (Introduction) to the Special Issue on "Global Value Chains in Law". In: Rechtswissenschaft 4, 456-462 (2022).
  • Vom korporativen Individualismus zum Gesellschaftsbezug multinationaler Unternehmen in einer internationalen Wirtschaftsordnung (From Corporate Individualism to Societal Embeddedness of Multinational Enterprises in an International Economic Order). In: Rechtswissenschaft 4, 518-551 (2022).
  • Domestic courts as guarantors of international cooperation for global climate protection - Insights from the German Constitutional Court's recent decision. ICON (accepted/to be published), 2022.
  • Rafforzare la tutela dell’ambiente grazie alle corti costituzionali nazionali? Commento alla sentenza sul clima del BVerfG. In: Corti supreme e salute 1, 47-68 (2022).
  • Internationaler Klimaschutz mithilfe nationaler Verfassungsgerichte? Erkenntnisse aus dem Klimabeschluss des BVerfG. In: Heidelberg Journal of International Law 82/1, 47-72 (2022).
  • Rechtsschutz in der GASP - Urteilsanmerkung zu EuGH, C-134/19 P (Rs. Refah Kargaran). In: Europarecht (EUR) Heft 4, 511-519 (2021).
  • Die Medienöffentlichkeit der Rechtsprechung und ihre Grenzen. Nomos, Baden-Baden, 2021, 481 p.
  • Social Media Communication by Judges: Assessing Guidelines and New Challenges for Free Speech and Judicial Duties in the Light of the Convention. In: Rule of Law in Europe - Recent Challenges and Judicial Responses. Springer International, Berlin 2021, 137-153.
  • Die OECD-Leitsätze als Instrument für den Klimaschutz. In: Zeitschrift für Umweltrecht (ZUR) Heft 10, 526-535 (2020).
  • The Use of Social Media by Judges in Germany, Impartiality of Judges and Social Media Cadenabbia, Italien. Konrad Adenauer Stiftung, Berlin, 2020, 40-49 p.
  • Anmerkung zu BGH, Urteil vom 19.09.2019, I ZR 91/18. In: Zeitschrift für das gesamte Lebensmittelrecht (ZLR) 1, 52-57 (2020).
  • Die Gemeinsame Außen- und Sicherheitspolitik der EU unter der Kontrolle des EuGH. In: EuZW 13, 506-511 (2017).
  • Die Dritte Gewalt in der Medienöffentlichkeit. In: Richterliche Abhängigkeit – Rechtsfindung im Öffentlichen Recht, 58. Assistententagung Öffentliches Recht. Nomos, Baden-Baden, 2018, 267-296 p.
  • Normative Guidance from Strasbourg Through Advisory Opinions. In: Heidelberg Journal of International Law 4, 821-846 (2014).
  • El potencial des Protocolo 16 al Convenio Europeo de Derechos Humanos. Hacia un diálogo institucionalizado que conduzca a la justicia constitucional. In: La garantía jurisdiccional de los Derechos Humanos. In: European Inklings 1, 122-155 (2015).
  • Ruling (In)directly through Individual Measures? Effect and Legitimacy of the ECtHR’s New Remedial Power. In: Heidelberg Journal of International Law 74, 1-40 (2014).
  • Freedom of Assembly in the UK - Part of a Venice Commission Study (prepared by Anne Peters/Isabelle Ley), 2014.


Working Papers

  • Commentary on Common Foreign and Security Policy of the EU (Art. 18, 23-29, 41 EUV). Grabitz/Hilf/Nettesheim, Das Recht der Europäischen Union, Publication in 2023.
  • Commentary on Art. 2 ECHR. European Convention on Human Rights in International context: Judicial Perspectives, Publication in 2022.


Further Publications


30 Mar 2023

The Judiciary and the Media

Presentation of phd-thesis at Sciences Po (Paris) in the HeiParisMax-Forum


16 Feb 2023

Comment on Prof. Spießhofer's presentation on unilateral regulation of entrepreneurial responsibility abroad

Workshop on Unilateral Environmental Law in the European Union

20 Jun 2022

Corporate Social Responsibility in Global Supply Chains: A Public Law Perspective

Colloquium on Public International Law at the University of Heidelberg

19 May 2022

Comment on Prof. Ruiz Fabri's presentation on ethics in international arbitration

Part of the Masterclass 2022 with Prof. Ruiz Fabri held at the Max-Planck-Institute

28 Sep 2021

Turkey's withdrawal from the Istanbul Convention - a public international law analysis

Organized by the Da-Migra network and the German Association of Women Lawyers

Berlin / Zoom

08 Sep 2021

The Climate Decision of the Federal Constitutional Court

University of Maastricht - Legal Colloquium

Maastricht / Zoom

21 Jun 2021

Discussion of FCC, decision of 24.03.2021 - 1 BvR 2656/18 (climate decision)

Monday Meeting

Max Planck Institute for Comparative Law and Public International Law, Heidelberg

27 May 2021

An interdisciplinary debate on current challenges to the freedom of science

Festival of Philosophy 2021 with Prof. Dr. Wilholt (University of Hannover)

Hannover / Zoom

22 Apr 2021

Jurisdiction as Potential Objection to the Extraterritorial Reach of Environmental Due Diligence Legislation?

Workshop on International Corporate Liability for Environmental Harm at the Federal Environment Agency

Berlin / Zoom

29 Mar 2021

Discussion of ECtHR, 31.01.2019, Az.: 13255/07 (Georgia v. Russia II)

Max Planck Institute for Comparative Law and Public International Law, Heidelberg

07 Dec 2020

Discussion of ECJ, 06.10.2020 - C 134/19 P (Refah Kargaran)

Monday Meeting

Max Planck Institute for Comparative Law and Public International Law, Heidelberg

25 Nov 2020

Menschenrechtsschutz in globalen Lieferketten

ELSA-Day Evening Lecture Heidelberg / Zoom

28 Sep 2020

Das geplante Lieferkettengesetz zur Einhaltung sozialer und ökologischer Mindeststandards in der globalen Lieferkette

Monday Meeting

Max Planck Institute for Comparative Law and Public International Law, Heidelberg

21 Sep 2020

Environmental duties of diligence for multinational companies in a German supply chain law

Conference on the German Supply Chain Law (organized by Verdi)

21 Jul 2020

Presenting a Legal opinion to the Federal Ministry of Environment

Concerning the inclusion of an environmental duty of diligence for multinational companies in a German supply chain law

27 Apr 2019

Freedom of expression of judges under the European Convention on Human Rights

Conference at the European Court of Human Rights, Strasbourg

09 Apr 2019

The use of social media by judges in Germany

Konrad Adenauer Stiftung, Rule of Law Programme Cadenabbia (Italien)

15 May 2015

The Media as a Vehicle for the Judiciary to Influence Social Transformations?

Conference on Law and Social Transformations Stanford Law School

14 Nov 2014

From Hercules to Hermes: Antithesis to the Rule of Law or Symbol of a Modern Judicial Role in Society?

Presentation of my dissertation project at the Doctoral Scholarship Conference at Yale Law School

Yale University

25 Nov 2013

Judicial Independence of Constitutional Court Judges of Germany

Seminar "Constitutional Review and Techniques of Constitutional Interpretation and Adjudication"

Max Planck Foundation for International Peace and the Rule of Law, Heidelberg

19 Dec 2012

State Responsibility in Public International Law

Part of the NIPPON-ITLOS Fellows Programms



Summer Semester

Challenges for European Human Rights: Climate Change, Migration, Digitalisation

Summer term 2022

Comparative Constitutional Law

Winter term 2021/2022

Preparing and discussing a mock exam in German public law and European Law

Winter term 2021/2022

Public International Law I

Winter term 2020/2021

Public International Law I

Summer and Winter Term 2013/2014

Preparation tutorial for the first state's exam in public law, University of Heidelberg

Participation in Conferences at Home and Abroad

2nd Doehring-Lecture with Prof. Schorkopf on the topic of "Human Rights and the Majority", Max Planck Institute for Comparative Law and Public International Law, Heidelberg, 22.10.2021

OECD Forum on Responsible Mineral Supply Chains, Paris / Zoom, 27.04.2021 - 28.04.2021

Expert discussion on the UN-Treaty for Business and Human Rights, Berlin, 20.10.2020

Masterclass with Prof. Weiler - How to Read Decisions of the European Court of Justice, Max Planck Institute for Comparative Law and Public International Law, Heidelberg, 15.05.2017 - 18.05.2017

54th Conference of German Research Fellows in Public Law , Graz

Colloque: Le cosmopolitisme juridique, Paris - Université Panthéon-Assas

Conference: Judgments of the European Court of Human Rights – Effects and Implementation, Göttingen

2nd Masterclass in International Law concerning "Law and Democracy in the postnational Framework" with Jürgen Habermas, Max Planck Institute for Comparative Law and International Law

Inaugural Masterclass in Public International Law, "The Political Economy of International Law", with Prof. Eyal Benvenisti , Max Planck Institute for Comparative Law and International Law

Luhmann Seminar at the Max Planck Institute for Comparative Law and International Law

  Workshop on "Transnational Corporations and NGOs in Public International Law", University of Erlangen


Ruprecht-Karls-Preis awarded by the Stiftung Universität Heidelberg for the best legal doctoral thesis in 2020 at the University of Heidelberg;

Scholarship for the doctoral thesis by Friedrich-Ebert-Stiftung

Scholarship for the law studies by Studienstiftung des Deutschen Volkes

Scholarship for the LL.B. studies by the Alexander-Lüderitz-Stiftung


German Association of Women Lawyers (Commission for Public International Law)

Former Member of the Association of Young Researchers in Public International Law



June-July 2014 Research stay at the University of Paris Assas with Prof. O. de Frouville

April-May 2014 Research stay at the University of Cambridge with Prof. J. Bell

August 2013 Research stay at the George Washington University Law School with Prof. S. Karamanian

28.1.2013 - 03.02.2013 Research stay in Straßburg at the European Court of Human Rights for the purpose of conducting interviews with Court Judges