Hans Slabbekoorn researches animal sounds and the effect of the noise we humans make on these animals. He is also committed to making his discipline more diverse.

Fishes rely heavily on sound to find their way during migration or dispersal. Many species are affected by noise pollution. Hans Slabbekoorn from the Institute of Biology Leiden received a HORIZON2020 grant of 500,000 euros to study the impact of sound conditions on movement decisions of fishes.

On 3 September 2025, more than 30 archaeological objects were returned to Peru, Panama and Costa Rica. The objects come from a private collection belonging to the descendants of physician and amateur archaeologist Dr Hans Feriz. In her will, his daughter stipulated that the objects collected by her…

Psychology teacher of the year is Marc Molendijk. The Master Thesis Awards are for Kim Houwaart and Linda Bomm. Hans van Lennep wins the PhD Publication Prize; Nina Komrij wins the PhD Wild Card: Societal Impact. The Support & Management staff Prize is for the whole Psychology Institute Office and Remond…

First year bachelor students of Security Studies enjoyed an interactive guest lecture by Han van Midden, former mayor of Roosendaal.

On Tuesday 29 November a sculpture made by Willem Knaup Verdwenen Jodenbuurt (Vanished Jewish Neighbourhood) was unveiled in the Cleveringa Lecture Room in a niche made especially for it. Speeches were given by Professor Rick Lawson, Eric Daalder and Professor Joanne van der Leun.

Last Thursday, the second ILS Lunch Seminar of this academic year took place. In this successful and well-visited edition, Hans-Martien ten Napel and Mark Leiser both gave very interesting presentations.

Hans Slabbekoorn, researcher at the Institute of Biology Leiden, is one of the editors of the latest volume of the Springer Handbook of Auditory Research (SHAR). This book is filled with everything known about the effects of sound on vertebrates. Slabbekoorn’s contribution to the book as a co-author…

Reseachers of the Institute of Environmental Sciences Leiden (CML) have contributed to a debate in the Journal Nature over whether lions in Africa can only be saved with dollars and fences.

A new study reveals how ancient Chinese farmers managed soil fertility and water resources over thousands of years. By analyzing carbon and nitrogen stable isotopes in millet crops, the research provides long-term isotopic evidence of farmland management practices in the Guanzhong Basin—the political…

On the evening of Tuesday January 31st, the physics institute organizes its triannual meeting for over seventy high school teachers. The program consists of lectures on developments in modern physics and the latest initiatives in the world of education.

A delegation of the Institute of Environmental Sciences (CML) of the Faculty of Science of Leiden University, led by the Dean of the Faculty of Science: Prof.dr. Geert de Snoo, visited the Kenyan ambassador Mr. Lawrence Lenayapa and his staff on Monday 29 of October in The Hague.

On 30 November 2023, Florian Theissen successfully defended his PhD thesis, 'Sincerely Believing in Freedom'.

The first eLaw Conference held at Leiden University was a success and fostered timely discussions on the legal challenges and opportunities presented by digital technologies.

Hans Slabbekoorn, researcher at the Institute of Biology Leiden, is from the 16th to the 26th of July on board of the Pelagia, the Dutch national sea research vessel, which is currently on a collaborative mission for the National Initiative Changing Oceans (NICO). Slabbekoorn will study the effects…

Siemens recently took over the Leiden software company Culgi, founded by professor and inventor J.G.E.M. (Hans) Fraaije. We spoke to him about the algorithm that made him successful, the role of a university in our society and his ambitions at Siemens. ‘I was looking for Siemens, and they were looking…

No less than 172 international master students coming from 30 different countries visited the Faculty of Science on 29 August during the OWL: the Orientation Week Leiden.

This week, Bart Custers, Professor of Law & Data Science and Head of eLaw – Center for Law and Digital Technologies, has been named Mr. of the Week by the Dutch legal magazine Mr. The occasion for this is the 40th anniversary of eLaw that will be celebrated this week.

Bart de Smit has been appointed to the position of Vice Dean of the Faculty of Science for four years, as of 1 January 2019. After Han de Winde stepped down as Vice Dean in September, De Smit already took over his duties ad interim.

'Een nieuw commentaar op de Grondwet' is the title of a book published this week. The book uses 35 essays to describe the importance of the Constitution to the Dutch democratic rule of law.

Professor Philip Spinhoven has been appointed acting Scientific Director of the Institute of Psychology until 1 September 2021. He succeeds Michiel Westenberg who resigned from the position 1 January 2021, because he could no longer combine the responsibilities of Scientific Director with his academic…

Experimental physicist Tjerk Oosterkamp and theoretician Hans van Leeuwen conduct research on the exact mechanism behind ice skating. De Volkskrant published a news item about it during the opening weekend of the Olympics.

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 James Webb Space Telescope has found evidence of carbon dioxide (CO₂) in the atmosphere of a giant planet 700 light years away. This result provides insight into the composition and formation of this gas giant and shows what James Webb is capable of. The research by the international group of astronomers,…

Archival research, which student of history has not done it? Many of us have spent days in brick buildings with artificial lights, staring at ancient documents with unreadable handwritten texts, hoping to find something that is useful. To some, this may sound dreadful, but to us? We love this stuff!…

On 23 November, more than 70 students visited companies at the Leiden Bio Science. This second edition of the BSP Excursion included a fundamentals track and had a special focus on start-ups.

The new academic year has started and with it education as well. Associate professor Dennis Claessen and Director of Education Han de Winde from the Institute of Biology Leiden devised an environmentally friendly introduction to the Leiden Bio Science Park for their students, with the help of Plastic…

Fish populations in lakes and rivers have declined in recent decades. This is probably due to light and noise pollution. The Horizon Europe grant enables ecologist Hans Slabbekoorn to investigate this and improve the situation for migrating fish. In order to do so, a seven-metre-long swimming tunnel…

Activities of Tony Roe, Catalina Vicens, Magda Pucci, Hans Kalliwoda, Gary Schultz, Eleni Kamma, and Danne Ojeda

How is it that the internet works so well, with billions of users sending millions of gigabytes all together every day? That's because the foundation of the internet is solidly set up. Yet sometimes there are problems on the internet. For example, when certain systems misbehave and disrupt the routing…

Photographs of sacred rituals and ceremonies in Asia by Bangkok-based photographer and author Hans Kemp can be seen in the front hall of the Leiden Town Hall from 27 June to 19 August 2019. Here a sneak preview.

For nine years he worked on the three-volume standard work Plant Galls of Europe. It yielded 2300 pages about 10,000 species of European galls, abnormal outgrowths in plants caused by parasites. Hans Roskam from the Institute of Biology Leiden: ‘The abundance of galls says something about the natural…

Early November, a delegation of the Faculty of Science visited two Indonesian universities to shape the collaboration in bioscience. The Faculty also opened a new Indonesian office in Yogyakarta.

Having to remind users of the café at the University Sports Centre (USC) about the 1.5 metre rule is something that can be quite difficult for the students who work there. Even more so since the restrictions on outdoor sports have been lifted. The students are now taking a course to show them how it's…

Our annual "Science to Experience" exhibition of student works is hosted by the V2_ Lab for the Unstable Media. This year's theme is "LIVING".

On June 6th, The Hague Journal of Diplomacy launched its latest double special issue, “Debating Public Diplomacy: Now and Next”, in Washington DC. The seminar on the future of soft power practices, at the Pew Research Center known of its global opinion polls, took place against the backdrop of concerns…

This week, Leiden University celebrates the fifteenth year of its world-class International Criminal Law Summer School. The International Criminal Law Summer School has convened every year since the creation of the International Criminal Court, guiding scholars and practitioners in this rapidly developing…

On Friday evening 17 September, Leiden astronomer Joe Callingham can be seen in a new series on Discovery channel. Killers of the Cosmos is about different deadly dangers lurking in the depths of space. Asteroids, cosmic debris, electromagnetic weapons… The show takes a film-noir approach to these threats,…

By chance, computer scientist Hans-Dieter Hiep (Leiden Institute of Advanced Computer Science and Centrum Wiskunde & Informatica) discovered a ‘gaping hole’ in a widely used method for evaluating software security. Hiep patched the hole, causing quite a stir in his field. 'It’s not pleasant when a PhD…

If doctors could better estimate a patient's chances of survival, this would help in choosing a specific treatment. It would be particularly beneficial for the rare and malignant Ewing sarcoma, which mainly affects children and adolescents. Mathematics professor Marta Fiocco has been awarded a substantial…

A month ago it was Marc Baggelaar, and now Hans Kistemaker too has obtained his PhD cum laude at the Leiden Institute for Chemistry (LIC). ‘He has made ground-breaking contributions to the world of protein modification,’ says PhD supervisor Gijs van der Marel. Kistemaker obtained his PhD on 11 May…

Han Meyer, Carola Hein, Paul van de Laar and Sabine Luning, argue that in the current moment of major crises these ship channels necessitate radical reconsideration.

On Monday 23 January 2023 J.T.P. (Hans) de Bruijn passed away at the age of 91. Until 1995 he held the Chair of New Persian Language and Culture at Leiden University.

Lodewijk Petram, author of the book 'The World's First Stock Exchange', discussed the rise of the Amsterdam stock exchange in the 17th century in the ninth Hazelhoff Guest Lecture.

Promotores: G.R. de Snoo, B. Sinsin, Co-Promotor: H.H. de Iongh

Human AI is where artificial intelligence and machine learning meet philosophy, cognitive science, and the creative arts. Examples of research questions in this domain are: 'Can an algorithm be creative by human standards?', 'Can creative processes, such as composing music or writing poetry, be modelled?',…

Tracking early human behaviour through plant processing and -exploitation.

The Journal of Global Slavery (JGS) aims to advance and promote a greater understanding of slavery and post-slavery from comparative, transregional, and/or global perspectives. It especially underscores the global and globalizing nature of slavery in world history.

Former PhD, Bachelor and Master students of the Van Exter Lab

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…