Countries that import plastic waste recycle an average of at least 63 percent of it. This is surprising, as we previously believed that the vast majority was incinerated or ended up as litter. This was discovered by PhD candidate Kai Li and his colleagues from the Institute of Environmental Sciences in…

In the next decades, thousands of wind turbines will be added to the North Sea. Environmental scientist Chen Li identified the most beneficial areas for their construction, focusing on material use, carbon footprint, and environmental impact. His paper was published in Environmental Science & Techno…

The Expat facility is a tax measure for employees from abroad and employees sent abroad by the University. Under specific conditions the employer may provide a maximum of 30% of your income in the form of an allowance for a temporary stay in the Netherlands or abroad. This allowance for so-called extra-territorial…

As of 1 July, Marcellus Ubbink is the new Scientific Director of the Leiden Institute for Chemistry. He will succeed Hermen Overkleeft, who led the institute since 2017. Ubbink has been appointed for a period of four years.

The Ministry of Health, Welfare and Sport (VWS) submitted Pharma-NL to the R&D program of the National Growth Fund, a 20 billion euro program of the Dutch government that intends to create long-term economic growth in The Netherlands.

On March 17, our dear colleague Jan Schmidt passed away after a fruitful and valuable life.

AI offers opportunities to make your work easier. However, there is also a downside to AI that may have consequences for your privacy and that of your colleagues. On this web page, you will find more information about the responsible use of AI within Leiden University.

In early 2026, two new programme directors will begin their roles at FWN. Joost Broekens will take charge of the bachelor’s programme in Data Science and Artificial Intelligence (DSAI), while Sander van Kasteren will become programme director of the MSc in Life Science and Technology (LST).

In the complex academic playing field, it is crucial that researchers and research support professionals know how to find each other. At Leiden University, these collaborations are indispensable too, say professor Gilles van Wezel and project manager Mariana Avalos Garcia. ‘Without support, this project…

Green spaces boost mental health—especially in busy cities. A new study from Leiden and Stanford University reveals how nature benefits urban well-being and offers low-cost ways to make city life healthier for everyone.

Opening van het Quantum Delta NL (QDNL) Talent & Learning Centre (TLC) Leiden-Delft.

As of 1 October, David Holmes has been appointed full professor of Pure Mathematics at the Mathematical Institute (MI). His work lies at the intersection of algebra, geometry and number theory.

The MSc Life Science & Technology receives a bronze medal in EW Best Studies 2023. Every year, Elsevier selects the top programmes in higher education. A medal means that students are above-average satisfied with the quality of their programme.

Library, Research

How can you ensure that your research hits the headlines? How can you bring your research output, such as PhD research or a publication, to the attention of the public?

Aline Vidotto has been appointed professor of Stellar and Planetary Astrophysics at the Observatory from 1 February. Vidotto has been with the university for 3.5 years and for her, the appointment is ‘a milestone in her career.’

Yesterday, eight professors were simultaneously inaugurated as ‘Medical Delta professor’, at Leiden University, LUMC, TU Delft, Erasmus University and Erasmus MC. Ariane Briegel, researcher of the Institute of Biology Leiden of Leiden University, also received the double appointment.

The fifth Leiden Research Support Network Conference, on Monday 16 June, was about the future of research support. A great opportunity for the 100 support professionals present to join interactive workshops and to network with colleagues from other faculties and the LUMC.

Thousands of first-year students and hundreds of mentors kicked off the EL CID on Monday morning. This year for the first time, the introduction week of Leiden University and Leiden University of Applied Sciences was also open for students of Regional Training Centre mboRijnland and the Leiden Instrument…

Organisation

Leiden University will set up further activities with the Asian Development Bank (ADB).

Education, ICT

Data from 41 million galaxies does not shake up the standard cosmological model after all. To that conclusion, to their own surprise, comes an international team of researchers including Koen Kuijken, professor at the Leiden Observatory.

Dr Maikel Kuijpers, a staff member at the Faculty of Archaeology and a guest researcher at the Centre for Environmental Sciences (CML), is participating in an exploratory interdisciplinary study on the Chinese Belt and Road Initiative (BRI). Made possible by a Seed Fund of the Leiden University Global…

When a spot in the core group of the Strategy Team became available, she immediately applied for the position. Because as Head of HR, Elice Schöne feels it is important that her department is well connected to the strategic plan.

The Academic Language Centre is organising an introduction to Ukrainian with the Russian Studies/Russian and Eurasian Studies programmes. This six-part course is meant primarily for people who are in contact with refugees from Ukraine.

The many thousands of small celestial bodies beyond Neptune’s orbit may have ended up there due to a star that passed close to the solar system billions of years ago. This is shown by Leiden simulation expert Simon Portegies Zwart, along with his German and Dutch colleagues. ‘We are answering several…

Organisation

February 8 saw the launch of the Medical Delta ‘Sustainable Hospitals’ Interdisciplinary Thesis Lab. The research projects will touch on different aspects of healthcare. The students hope they will be able to offer practical solutions to make hospitals greener.

Astronomers and surgeons from Leiden are collaborating with industry to develop an optical instrument that delivers faster, more accurate imaging of tumour tissue and abnormal blood flow during surgery.

With the holidays just around the corner in this dark month of December, when we light candles as a symbol of warmth and hope, we would like to take a moment to reflect on this past year. We have accomplished a great deal together but the year has been difficult at times.

Bacteria whirl around in the mouths of most people, forming dental plaques and sometimes causing nasty gum infections. Treponema denticola might be a dangerous pathogen, but not much is known about this bacterium. It was up to Ariane Briegel and her research group to change that.

Elena Maria Rossi is fascinated by black holes. Her appointment as a professor was a long-held wish, partly because there are so few female professors in her field. ‘My appointment is also a milestone for the Leiden Observatory.’

How wonderful would it be to use art, technology and science in Ukraine's recovery? Young Ukrainians currently residing in Poland get guidance to develop creative programmes and activities that can later be implemented. Leiden astronomers Pedro Russo and Kateryna Frantseva cooperate in the project.

He makes music, goes to the athletics track twice a week and, according to his supervisor, has done his research so well that it would not be out of place in a PhD research. Physics and astronomy student Hidde Stoffels' undergraduate research on the properties of dark matter is of such high quality…

With the appointment of Dennis Janssen as operational director at the end of last year, the management team at the Observatory is now complete. Janssen has been working at the university for over twenty years, but the faculty and the Observatory are new to him.

‘AI can’t do half as much as people think,’ says computer scientist and psychologist Roy de Kleijn. He tries to teach robots seemingly easy things, and keeps on discovering how smart human intelligence really is. Three things that computers are no way near doing.

Should we be growing rice and building materials instead of grass for cows? From invasive crayfish to cultural heritage and groundwater levels: ten graduating students explored the future of the Groene Hart, the rural region just outside the cities of Delft, Rotterdam and Leiden where they study.

Museum De Lakenhal issued an open call for creative solutions to the problem of growth addiction. From over 500 submissions, they selected 15 artworks for the exhibition 'If things grow wrong'. These include the creations of Leiden researchers Peter van der Putten and Evert Jan van Leeuwen.

Astronomers led by Simon Portegies Zwart used simulations to reconstruct how three stars were ejected from the star cluster R136, 60,000 years ago. The analysis reveals that five stars were involved in the event in the Tarantula Nebula.