Is EU law still supreme? Most national high courts have formulated some limits on the absolute supremacy claimed by EU law.

Mark Klaassen presenter at the Reuniting Families: From Access to Integration event organized by the EU office of the Red Cross in Brussels.

Maartje van der Woude, Professor of Law and Society at the Van Vollenhoven Institute for Law, Governance and Society, has been elected, after a vote among the members of the Law and Society Association (LSA), as one of the eight ‘elected trustees’ to join the ‘Board of Trustees’ of the LSA.

The JASON Institute, together with the Jean Monet Centre of Excellence, Leiden University Campus The Hague, the Ministry of Foreign Affairs and Jonge Atlantici, is very pleased to invite you to the Symposium on European Defence- and Security Policy.

Beryl ter Haar is currently a Visiting Professor at the University of Warsaw, Poland. The Law School is the oldest part of the university (founded in 1808), followed by the School of Medicine (founded one year later). The two schools became the heart of Warsaw University which was founded in 1816 by…

The Advisory Committee on Public International Law (Dutch abbreviation CAVV) is an independent body which provides the government and parliament of the Netherlands with advice, both solicited and unsolicited, on issues related to public international law.

Konstantinos Zoumpoulakis, Research Assistant at the Institute of Criminal Law & Criminology, has written a report on this conference

Glucocorticoids (GCs) are widely prescribed as anti-inflammatory drugs due to their well-established immunosuppressive effects.

Dr. Kosta presented at the Global Forum on Democratizing Work.

On 27 November 2018, the Center for Legal and Comparative Studies of the East African Community of Leiden University (LEAC) is organizing, in close cooperation with Strathmore University Law School, the University of Nairobi Law School and the IRID, the Fourth LEAC Conference on the topic “Teaching…

At the conference ‘Law-Making in Multilevel Settings: Federalism, Europe and Beyond’, Ruben de Graaff and Dorine Verheij provided a lecture on the topic of ‘EU Regulations and the Spirit of Codification’.

Simona Demková from the Europa Institute participated as a key speaker at the annual Digital Constitutionalism Academy on 27 and 28 March 2025. The Academy brought together leading scholars and practitioners to explore the evolving intersection of digital innovation, fundamental rights, and regulatory…

The new Dutch cabinet aims to reduce the number of asylum seeks coming to the Netherlands by introducing a number of asylum policy measures. Dr Mark Klaassen, Assistant Professor of Immigration Law, discusses this in Dutch daily newspaper 'de Telegraaf'.

In October, Sophie Starrenburg was elected as a member of the Coordinating Committee of the ESIL Interest Group on the International Law of Culture. She will work alongside Giovanni Carlo Bruno (Italian National Research Council), Andrzej Jakubowski (Polish Academy of Studies), and Lucas Lixinski (University…

In the Pioneers of Leiden University series we talk to past and present students who were the first in their family to go to university. In this fourth instalment: alumnus and philosopher of law Ali Kösedag (1992): ‘Philosophising about equality before the law in the Netherlands at an early-morning…

Students attending Richard Albert’s seminar on constitutional change asked Reijer critical questions about an article he recently wrote with Maarten Stremler.

We are glad to present our new research report on Exploring the Frontiers of International Law (EFIL). International Law has traditionally been one of the flagship areas of the Leiden Law School. The report provides a taste of our rich research agenda in international law.

Free trade negotiations and agreements are important instruments of EU trade policy. An increasing number of EU climate, environmental and sustainable development objectives play a role in free trade agreements.

Cijfers van Binnenlandse Zaken laten zien dat de wachtgeldregeling voor politici, in tien jaar tijd – door drie gevallen kabinetten - vijf keer groter is geworden. Barend Barentsen, deskundige in sociaal zekerheidsrecht, zegt in het FD dat dit ‘schuurt met de regeling om steeds meer versoberingen in…

Lecture, China Seminar

In October 2020, the Dutch Journal of Administrative Law had a special PhD issue, giving an overview of all PhD research currently being conducted in the area of administrative law in the Netherlands.

The Graduation Ceremony 2022 of the master's Law & Society took place on 7 September 2022 in the Telders Room of the Academy Building in Leiden.

The Global Summit on Constitutionalism took place from 16 to 18 March. Wim Voermans, Gert Jan Geertjes and Rowie Stolk, from the Department of Constitutional and Administrative Law, travelled to Austin where the conference was organised by the School of Law of the University of Texas at Austin.

Bernhard Rieger leaves University College in London to research European History after 1945 at Leiden University. He will start as professor of European History on January 15th 2018.

On 15 May the Space Law Moot Court Competition was held in the council chamber of Leiden Town Hall, organised by the International Institute of Air and Space Law (IIASL).

On Friday 14 June 2019, the second young researchers workshop was held within the framework of the Jean Monnet Chair on Mobility and Security in Europe. It was followed by an expert round table organized in cooperation with the Centre for the Law on EU External Relations (CLEER) of the Asser Institu…

On Wednesday 9 March, a Faculty meeting about the war in Ukraine was held for staff and students in the Lorentz Lecture Hall. By the time the meeting started at 17.00 hrs, the 220 available seats in the lecture hall had been filled mainly by large numbers of students.

From Friday 29 till Sunday 31 March 2019, the third edition of the Ian Fletcher International Insolvency Law Moot (Moot) was held at the Singapore Management University in Singapore. For the first time, a team from Leiden University took part in this prestigious competition. With success, the team qualified…

Professor of Law and Society Maartje van der Woude (Van Vollenhoven Institute) will give a lecture at the Institute of European Studies of the University of California in Berkeley on 4 March 2019.

The Summer School ‘The European Union, the United Nations and Global Governance’ is open to Master-level and PhD students. It is supported by the European Union’s Jean Monnet program.

On Thursday 3rd of March 2016 the 14th Norbert Schmelzer, organized annually by the CDA party, took place in the Hague. This year the lecture was given by Commission President Jean-Claude Juncker.

On 27 February, Rodrigo Pica, Secretary of Chile’s Constitutional Court, gave a lecture to the students of the Advanced Master’s in European and International Human Rights Law at Leiden Law School.

On April 19, 2018, the University of Vienna organized an international conference on the topic of equality bodies.

Like many moot court competitions around the world, the Leiden-Sarin International Air Law Moot Court Competition was conducted fully online this year. The International Air Law Moot Court is an unparalleled forum for bringing together students and aviation professionals who share a passion for air…

Oxford University Press has published the edited volume based on the European Law Institute's (ELI) project 'Rescue of Business in Insolvency Law'. The project ran from 2013 to 2017 under the auspices of the ELI and was conducted by Bob Wessels and Stephan Madaus, who were assisted by Gert-Jan Boon.

De IND wil - ondanks het bewind van Taliban in Afghanistan - meerdere Afghaanse vrouwen terugsturen. Verschillende experts van vijf Nederlandse universiteiten – waaronder Mark Klaassen, universitair docent immigratierecht - zeggen in Trouw unaniem dat het terugsturen van vrouwen onacceptabel is.

The number of children being housed in emergency asylum accommodation has skyrocketed over the past two years. Various agencies have been issuing warnings for several years about the distressing conditions found in emergency accommodation in the Netherlands. Dr Mark Klaassen, Assistant Professor of…

On 6 September 2023, the General Court of the Court of Justice of the European Union delivered its ruling in T-600/21 WS and Others v Frontex, dismissing a damages claim brought by a family of Syrian refugees against the EU agency Frontex.

In April 2018, Melanie Fink was elected as a member of the Coordinating Committee of the ESIL Interest Group ‘The EU as a Global Actor’. For the next four years, she will work in that function alongside Christine Kaddous (University of Geneva), Anne Thies (University of Reading), and Ramses Wessel (University…

In store is now the Research Handbook on Labour, Business and Human Rights Law edited by prof. Janice Bellace of the University of Pennsylvania and ass. prof. Beryl ter Haar of Leiden University. The book is publisehd in Edward Elgars series on Human Rights.

In the last week of January, Prof. Rex Arendsen and PhD candidate Maarten Manse of the Department of Tax Law at Leiden Law School, taught an ‘Intensive Course on Tax Law' at the Gadjah Mada University (UGM) in Yogyakarta. This week of lectures illustrates the fruitful cooperation between both univer…

Three professors, including Leiden Professor of Constitutional and Administrative Law Wim Voermans, sent an urgent letter to the Dutch Senate on 29 May 2023 concerning the new pension system. The criticism focuses not so much on the content of the new pension system, but on the fact that, according…

Yesterday, the European Commission presented its long-anticipated proposal for an AI regulation. After the Commission had outlined the European legislation at the start of 2020 in its white paper on artificial intelligence ‘A European approach to excellence and trust’, a concrete proposal for a European…