A hidden disability can make studying a considerable challenge, partly because of the disability itself, but also because others may not realise that extra support is justified. To overcome this problem, the Faculty of Humanities is introducing the Hidden Disabilities Sunflower.

In our building, a new, colorful exhibition is now on display! Twelve artists from the collective "De Leidsche Mondialen" are showcasing their work in various locations within the Faculty of Social Sciences (FSW).

Do people actually understand the constitution? This is what Jelle But, PhD candidate at Constitutional and administrative law, wondered. To find out, he conducted a survey among 1333 respondents. His research shows that lawyers and other legal professionals actually do not have a better understanding…

Lecture, Research Seminar

We provide answers here to some frequently asked questions about collaborations with the fossil fuel industry.

Congratulations on your awarded grant. Here is a checklist of what to do next and who you will need to involve to get your project started.

Having received a European Research Centre grant in 2025 the Connected Communities in Early Medieval Europe (COCO) project kicked off with a three-day long programme last month. From the 28th to the 30th of April the National Museum of Antiquities and the Faculty of Archaeology hosted the meetings bringing…

Students of the Advanced MSc in International Relations and Diplomacy visited the OPCW and ICJ in The Hague, gaining insights into key international organisations.

Seksueel misbruik tussen broers en zussen kan ook na jaren nog grote impact op de familierelaties. Dat blijkt uit onderzoek van Sheila van Berkel, Iva Bicanic en Anja van der Voort, die slachtoffers met elkaar in gesprek brachten over hun ervaringen. ‘Ouders ontkenden of minimaliseerden het misbruik…

A higher level of legal firearm availability does not lead to more violent deaths in Europe but does lead to more female deaths.

Orange the World 2025

From the start of your PhD you make agreements with your supervisors concerning your personal development and the supervision you receive. These agreements should be recorded in a Training and Supervision Plan. This plan contains agreements concerning your research, supervision, training, and potential…

Complete open access may not be possible because of various reasons: research ethics, privacy legislation, intellectual property, continuing research. The Easy archive at KNAW/DANS provides various access levels to deal with these issues.

Conference

Nature News reported on the use of bow-and-arrow for hunting based on the research made on small points found in a 54,000-year-old cave site in southern France.

Inaugural lecture

Inaugural lecture

Inaugural lecture

Lecture, Leids Actualiteitencollege

The steady decline in lethal gun violence in the EU came to halt in 2012 and some countries, such as Sweden, have even noticed an increase since then. An arms race among drug criminals and an increase in the availability of illegal firearms could lead to more criminal and gun violence. This is one of…

Leiden criminologists have co-developed an artificial intelligence technology that tracks firearms incidents by scanning over 350 news sources.

Valedictory lecture, minisymposium

Gerard van Westen has received the KNCV Gold Medal, the most important Dutch award for chemists under 40. 'It's a huge honour,' says the professor of AI and medicinal chemistry. 'I am now part of the group of people I was always impressed by.'

What is the best way for us as a society to deal with all the different forms of diversity? Professor Marlou Schrover will use the EuroScience Open Forum (ESOF) to explore this question with colleagues and the public.

Protests against textbooks on trans persons in America and against a reading hour by drag queens in Rotterdam: it has been raining protests recently against people with a gender expression that does not match their birth sex. Why does this evoke such resistance? We asked Professor by special appointment…

What role does the frontal lobe play in understanding sentences? Assistant professor Jurriaan Witteman has received a grant to replicate a leading study on this question. ‘As there is some doubt about the reliability of existing neuroimaging results, it’s important to replicate influential studies.’

Francien Dechesne, Associate Professor of Ethics and Digital Technologies, has been appointed by the Tilburg School of Humanities and Digital Sciences of Tilburg University as Professor to the endowed chair of ‘Data and AI for the Rule of Law’, effective 1 November 2025.

Lindsey Boosten followed her passion by combining the study of aviation and law in the Advanced Master in Air and Space Law in Leiden. It turned out to be a great choice: ‘It was one of the best years from my student days.’

research support portal

The Leiden Research Support Network is the essential network for research support professionals within Leiden University, where colleagues work together and share their knowledge to provide optimum support for researchers. The network's strength lies in the collaboration throughout faculties and ins…

PhD defence

Eva Michaels talks about the current international security environment, including intelligence issues with Sir John Sawers in an interview in El País.

In zijn boek 'Chasing Events' onderzoekt Thijs van Dooremalen hoe we de impact van ingrijpende gebeurtenissen echt kunnen begrijpen. Hij laat zien dat traditionele vergelijkingen tekortschieten en pleit voor een nieuwe manier om de effecten van 'events' op lange termijn te analyseren.

That Tessa Schiethart finished her bachelor's degree in International Studies with a thesis on Indonesian women's reasons for veiling was a coincidence. Or so she thought. Six years later, her book Seeing and Being Seen, in which she writes about her life with a wine stain and vision loss, is in the…

A new graphene-based method could make for faster, cheaper and more accurate DNA sequencing, say a group of Leiden physicists and chemists.

On 15 April, our much-beloved and highly respected former colleague Dr Hans Brussee passed away from cancer. In January 2025, Hans began experiencing neck pain. Initially, it appeared to be a herniated disc, but sadly, the diagnosis was soon revised, and his condition proved untreatable. Hans was 77…

The fastest chemical reaction in the universe takes place inside our eyes.

From a queer art exhibition to a podcast about people with disabilities, the JEDI Fund this year again honored several projects that contribute to diversity and inclusion.

If you need any help with your research or if you encounter problems during your PhD track, Leiden University provides several different types of support for PhD candidates. There are also groups, networks and communities in which you can meet other PhD candidates.

On 28 September the famous chemists Carolyn Bertozzi visited Leiden University to speak at the LED3 seminar. Just one week later, she was announced winner the 2022 Nobel Prize in Chemistry. Leiden chemists Sebastian Pomplun and Hermen Overkleeft are fan: ‘We are extremely honoured to have hosted this…

In an interview with Jaap van den Herik, Professor emeritus Law and IT, legal magazine Mr. writes that The Hague municipality wants to attract more legal tech start-ups. The municipality has therefore commissioned the Leiden Centre of Data Science (LCDS) of Leiden University to conduct a study into…

Conference, Van willen naar zijn

How do you write a job advertisement that appeals to both men and women? This question is particularly pressing in French, where every noun has a clearly visible grammatical gender. University researcher Benjamin Storme investigated how employers can best deal with this issue.

Lecture, Com(parative) Syn(tax) Series

The war between Ukraine and Russia is playing out not just on the battlefield but also on the geopolitical playing field of gas. Conflicts at the start of this century about this energy source were, says PhD candidate Ilia Barboutev, a precursor to today’s war.

Valedictory lecture