Over 300 people from 38 different countries took part in the online lecture

This collection includes six short policy-focused contributions exploring how legislation and policy on counter cyber terrorism unfold at the national level in the United States, the United Kingdom, China, Russia, France, and at the regional level of the European Union.

The illegal use of hand grenades has generated a lot of public interest over the last few years but very little is known about the nature and extent of these incidents. This research project is trying to fill that gap.

After this course, you will

On Monday 11 September, Matthew Hoye presented an early draft of a grant proposal on 'Remittance, Paradigms, and Extreme Cases' during a GTGC lunch seminars.

In the track Terrorism and Political Violence you will be familiarised with the academic debate regarding these contested concepts.

The Terrorism and Political Violence research group at Leiden University examines the causes of radicalisation, the tactics of extremist groups, and the effectiveness of counter-terrorism policies. We also explore the role of the media and the influence of postcolonial legacies in the Global South,…

This dissertation examines the European Union’s response to the growing problem of disinformation. It uses this case to critically analyse how societies interpret and manage information challenges such as ‘fake news’ and propaganda.

Terrorist attacks are not an end in themselves, but a means of creating unrest and fear. Terrorism policies and research should focus more on managing fear and social unrest.

Are you thinking about studying Crisis and Security Management: Terrorism and Political Violence ? Learn more and watch the videos.

The course is taught by experts from Leiden University’s Institute of Security and Global Affairs (ISGA) and guest speakers from the Centre for Professional Learning (CPL). They bring academic depth and practical experience from the fields of security policy, counterterrorism, and international rela…

Moving an electron microscope of 2000 kg is a delicate challenge. The highly sensitive instrument needed to be moved to a new measurement hall, but even a tiny bump could damage it. After a few nerve-racking weeks of preparing the move and reinstalment, the researchers finally have a verdict: the instrument…

Every summer, Leiden University is the setting of dozens of summer schools in which professionals and students can receive extra training on a specific topic within a short space of time. We took a look at a summer programme on extremism. ‘A recruiter for al-Qaeda said that I could change the world.…

Director General of ESO, Tim de Zeeuw received President of the Republic of Chile, Michelle Bachelet Jeria for a ceremony marking the first stone of ESO’s Extremely Large Telescope (ELT).

Janna Marie Bas-Hoogendam is a neuroscientist at the Institute of Psychology and conducts research on the brains of families suffering from social anxiety disorder. Janna Marie's research has caught attention that led to media appearances.

What happens to children of extremist parents? Commissioned by the Scientific Research and Documentation Center (WODC) of the Ministry of Justice and Security, four ISGA researchers, Layla van Wieringen, Daan Weggemans, Katharina Krüsselmann and Marieke Liem, wrote a report on the nature and extent…

This research examines how right-wing extremist parents perceive and discuss their role in the ideological socialisation of their children.

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.

On Saturday 15 February 2020, the Leiden University Thesis Prizes were presented during the Dies celebration day for alumni. Joint first prize went to Vincent Peeters, who was awarded a cum laude master's degree in Criminal Law and Criminal Procedure in August 2019.

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.

The rise of extremism in Europe has increased polarisation. The EU-funded DRIVE project, led by Tahir Abbas, Professor of Radicalisation Studies from Leiden University’s Institute of Security and Global Affairs, explores how social, structural, and individual factors contribute to radicalisation, offering…

When does radicalization not lead to terrorist attacks?

This report examines the questions

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.

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.

PhD-student Nikki Sterkenburg studies far-right extremist groups. But how does she get in touch with these groups? And what do you do if you stumble upon illegal activities? She explains in our podcast series (in Dutch).

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…

After a career spanning decades in intelligence services, Berrie Hanselman could have simply retired, but he chose not to. The Achterhoek native decided to continue and even earn a PhD on his subject: left-wing extremism. Gaining insight into the life of the left-wing activist who does not shy away…

Dutch troops, judges and politicians collectively condoned and concealed the systematic use of extreme violence during the Indonesian War of Independence. Historians have now shown how this could happen. ‘It was scandal management rather than prevention,’ says Leiden historian and research leader Gert…

Roughly arrested and subjected to extreme isolation. Using his experience, expert Jason Bhugwandass spoke to 50 young people who have spent time on Zikos wards (‘very intense, short-term observation and stabilisation wards’). He concluded that they’re ‘mostly locked up’ and leave ‘even more traumatised’…

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.

Vincent Bakker, PhD Candidate at the Department of Economics, was awarded the Research Master’s Thesis Prize 2017 of the Faculty of Social and Behavioral Science.

Vincent Bakker has won the 2017 Thesis Prize of the research master’s programme Political Science and Public Administration. His study of labour market effects of social investment policies is the crowning achievement of Bakker’s work as a MSc student. It also marks the start of his academic career.…

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?

Study information

Study information

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

‘Countering violent extremism – the international deradicalization agenda’ is the name of the book Tahir Abbas published last month. In this interview the associate professor in Terrorism and Political Violence at ISGA tells about the backgrounds and goals of the book.