On 8 March 2023 Helen Duffy, Professor of International Human Rights and Humanitarian Law in Leiden, published a monograph on Global Trends in Counter-terrorism and the Implications for Human Rights in Africa.

In the Master's programme Crisis and Security Management, specialisation Terrorism and Political Violence, we focus on the academic body of knowledge on different form of protests, contention, resistance and violence. We explore and explain the emergence of radical and extremist movement.

When does radicalization not lead to terrorist attacks?

This report examines the questions

By looking at what is different, researchers often discover the special, the unusual. And that has already brought a wealth of highlights – also in Leiden.

The widely used pesticide thiacloprid can cause a large-scale decline in freshwater insects. This was discovered by researchers from the Living Lab in Leiden. For three months they counted the flying insects in the 36 ditches of the lab. Their research appeared in PNAS.

For the first time, an international team of scientists led by Leiden Observatory and SRON can explain the extreme jet streams observed around the equators of all the giant planets using a single model.

The question of how military interventions can best transition to a long term counter-terrorism policy forms the core research question of three interlinked reports. This research project has been completed with support of NATO’s Science for Peace and Security Programme. Leiden University researchers…

All players on the world stage operate strategically in order to safeguard their interests. Political scientists at Leiden University cast light on this volatile interplay of forces. Their research helps voters, NGOs, governments and international organizations make smart choices in this complex and…

Since 2012, thousands of individuals have traveled from Western countries to join jihadist groups in Syria and Iraq. While much has been written about these individuals, only sparse attention has been paid to the social environment of these jihadist travelers and, more specific, the role of family members…

Joseph Callingham from the Leiden Observatory receives the Louise Webster Prize for outstanding post-doctoral research. The prize is awarded by the Astronomical Society of Australia for Callingham’s search for the most extreme object in the Universe.

The Farm to Fork Strategy seeks to transform the EU food system towards greater sustainability. To do this, Vincent Delhomme argues, some of the traditional concepts and doctrines in EU internal market law need to be challenged and rethought.

Vincent Delhomme delivered a keynote speech on the topic of food affordability at the European Parliament in Strasbourg, on 22 January 2025. The event focused on achieving a balanced food system that is sustainable, healthy, and affordable.

Front-of-pack nutrition labelling, origin labelling, regulation of voluntary green claims made by food business operators: the EU is currently looking into various reforms of the legal framework for food information to consumers. The goal: healthier and more sustainable diets.

In 2010, the remnants of a 16th century indigenous village were discovered in St. Vincent, on the construction terrain of the new International Argyle Airport.

The newly created European Law Unbound Society (ELU-S) held its inaugural conference on 25-26 September 2025, at the Charles University in Prague. Vincent Delhomme presented a paper and chaired a panel, both dealing with contemporary challenges in EU internal market law.

Polarisation in our society is on the rise. What makes people increasingly radical? How do we protect ourselves from extremist, terrorist or criminal threats, be they physical or in the cyber world? And what role do intelligence services play in this?

Ragazzi, ‘Suspect community or suspect category?‘, Journal of Ethnic and Migration Studies

How to minimalize the chance of recidivism for extremist prisoners.

Physical chemist Rik Mom developed a revolutionary way to investigate catalysts in action in detail. For this work he received the distinction cum laude during his PhD defence on 29 June.

A professor from Leiden University has subjected various colleagues to intimidating and unacceptable behaviour for a longer period. These are the findings of an investigation carried out by the University’s independent Complaints Committee for Unacceptable Behaviour at the request of the Executive Board…

From 2012 onwards the primary scholarly and media focus in regard to foreign fighters has been on the large number of Westerners joining jihadist groups in Syria and Iraq. Yet, much less attention has been paid to another conflict in the ring around Europe that attracted foreign fighters: the Russo-Ukrainian…

Nobody is better qualified to tell you what it is like to work at Leiden University than the employees themselves. Watch the videos and meet your future colleagues. They will be happy to share their experiences with you.

Interdisciplinarity is more than a buzzword in academia. It’s essential for tackling today’s biggest challenges. But what does it look like in practice? How can PhDs learn the skills needed to work across disciplines, and how can supervisors master the art of guiding them?

This paper contributes on an increasing body of work on radicalisation. It specifically focuses on what distinguishes individuals whose behavioural radicalisation includes involvement in terrorist violence from those whose behavioural radicalisation does not.

This article presents the findings of an explanatory study into the perceptions of Dutch Muslims in The Hague concerning pre-emptive counter-extremism and de-radicalisation policies.

This article researches the public perception of terrorist attacks by measuring the importance the public assigns to attributes of terrorist attacks.

This article presents an in-depth evaluation of a specialized reintegration initiative within the Dutch Probation Service focused on individuals convicted or suspected of involvement in terrorism.

In this article, Tokdemir & Klein examine the strategic actions of governments against domestic terrorist groups and domestic terrorist groups’ reactions to such actions.

This book contextualizes the use of terror as part of wider movements of political contention, demonstrating that terroristic innovation occurs as part of wider historical processes rather than in a vacuum.

The study by Tahir Abbas and Liselotte Welten reveals a structural and nuanced understanding of how the question of Salafism in the Netherlands has become an increasingly discussed phenomenon and the types of threats that ought to give genuine concern to security, intelligence and policing services.

Prof.dr. Vincent van Heuven has been appointed as a member of the Royal Academie of Dutch Sciences (KNAW).

On 1 and 2 December 2022, Vincent Delhomme and Carina van Os participated (Europe Institute) in the workshop ‘The European Health Union - Setup, challenges and global outlook’, held at the Max Planck Institute for Comparative Public Law and International Law in Heidelberg. Vincent had the opportunity…

On 26 October 2023, Vincent Delhomme spoke at the inaugural conference of the newly founded ICON-S Benelux Chapter, hosted by Maastricht University. The overarching theme of the conference was 'Crises, Challenges, and the Future of Public Law'. Vincent participated in the panel on ‘The challenges of…

On 19 October 2023, Vincent Delhomme spoke at the conference on ‘European Judicial Narratives’, hosted by the University of Louvain Saint-Louis in Brussels. Vincent participated in the panel devoted to the reception of these judicial narratives in the European legal epistemic community.

Could policies aimed at preventing radicalisation undermine the very trust and social cohesion they aim to strengthen?

In this blog post, Linda Slapakova discusses the various roles that AI plays in counter-disinformation efforts, the prevailing shortfalls of AI-based counter-disinformation tools and the technical, governance and regulatory barriers to their uptake, and how these could be addressed to foster the uptake…

It is always a pleasure when a young academic can reach out to the broader public and discuss his/her research's societal relevance and impact. Our own Vincent Walstra has been doing very well on disseminating his work and featuring in various media. This is a list of his recent publications and int…

This research sets out to answer the following questions:

In the EU Law Live podcast episode ‘Tax, gambling and the internal market’, Vincent Delhomme discusses the recent Admiral Gaming Network case, dealing with the validity under EU free movement provisions of national tax measures in the field of gambling.

On 10 February 2025, Vincent Delhomme attended the official launch of the new EU Health Union Fellowship at the College of Europe (Bruges), where he delivered a two hour lecture on EU health governance.

The second and final report on the Netherlands‘ crime-terror nexus has analysed all fourteen profiles of individuals arrested in 2015 for offences of terrorism.

The combination of academic and professional skills taught in the CSM prepares you for a wide variety of careers in the rapidly expanding domain of security and crisis management, including public or private sector and policy-making positions.

The combination of academic and professional skills taught in the CSM prepares you for a wide variety of careers in the rapidly expanding domain of security and crisis management, including public or private sector and policy-making positions.

The combination of academic and professional skills taught in the CSM prepares you for a wide variety of careers in the rapidly expanding domain of security and crisis management, including public or private sector and policy-making positions.

The combination of academic and professional skills taught in the CSM prepares you for a wide variety of careers in the rapidly expanding domain of security and crisis management, including public or private sector and policy-making positions.

The combination of academic and professional skills taught in the CSM prepares you for a wide variety of careers in the rapidly expanding domain of security and crisis management, including public or private sector and policy-making positions.

This project investigates which aspects of social media content adolescents attend to and how these relate to their credibility judgments, aiming to systematically understand their susceptibility to misinformation and inform effective educational programs that foster youth’s resilience to misinforma…