The year 2023 saw the earthquake in Turkey and Syria, the Wagner Group rebellion and wildfires and floods as all the weather records were smashed. Our most-read stories were about the climate crisis and the elections: here’s the list.

Carel Stolker, former Rector Magnificus and President of the Executive Board of Leiden University, has been made an Officer in the Order of Orange-Nassau for his services to the city and University. Mayor Henri Lenferink awarded the royal honour to Stolker at the University’s Dies Natalis on 8 February…

Leiden University will not enter into any new research partnerships with companies in the fossil fuel industry that are not intensively and demonstrably committed to achieving the goals of the Paris Agreement. Current projects can, however, be completed.

Hans Slabbekoorn is specialised in animal sounds. On 1 July, he was appointed professor of Acoustic ecology and behaviour. A great honour, according to the new professor. ‘This job never gets boring, whether I am investigating the urban jungle or marine noise.’

When biology student Mike Groenhof was making a phylogenetic tree of fifty shrimp species for his internship, one specimen turned out to be an undescribed species. The animal was collected by Naturalis scientist 18 years ago, and had been under the radar ever since.

Facility, Organisation

Lecture, Studium Generale

Annetje Ottow is the first female president of the Executive Board of Leiden University, which means a return to her Alma mater.

Students from Leiden University have launched The Nuance Project, a platform for respectful, open-minded dialogue on divisive issues. The aim is to foster connection and understanding among people even if their viewpoints differ.

Eight scientists from Leiden University have been awarded a grant by the Dutch Research Council (NWO). With this Vidi funding, the researchers can set up an innovative line of research and further expand their own research group over the next five years.

What will happen if the lights in a large part of the city are switched off? How many stars can you see without all that light pollution? This is what researchers, artists and the residents of Leiden are going to investigate during Seeing Stars Leiden on 25 September. ‘Leiden is the ideal place for…

She narrowly defied bureaucracy and spent days angling for cod. In the North Sea, marine biologist Inge van der Knaap discovered that noise significantly disturbs fish behaviour. ‘There is now a lot of attention for underwater noise.’

Leiden University is seeking bids from developers for housing in Nieuw Rhijngeest-Zuid, the Oegstgeest part of the Leiden Bio Science Park.

You win the Leiden Teaching Prize and suddenly all eyes are on you. Three past recipients reflect on how this student-awarded prize has changed how they work and improved their teaching – and how they chose to spend the money.

Connecting worlds, enhancing research and teaching, and providing innovative solutions to complex social issues: that is the idea behind interdisciplinary research. In that respect, a huge amount happened at Leiden University in 2023.

The new interdisciplinary bachelor's program in Science for Sustainable Societies starts in the 2025-2026 academic year.

The theme of the Heritage Open Days Leiden on 10 and 11 September is sustainability. At four University locations guides will talk about the history of the buildings and how they have been renovated. And there is a first: tours in sign language.

The Plants & Planets exhibition brings two worlds together in a dazzling mix of science, nature and art. It opens at Old Observatory Leiden and Hortus botanicus on 7 February.

Festival

The university bid farewell to its Rector Magnificus, Hester Bijl, on 13 January during the ‘Hester’s Highlights’ symposium.

Exhibition

Arts and culture

Annetje Ottow is stepping down as President of Leiden University’s Executive Board on 1 September 2025 after almost five years in the role. She looks back at the highs and lows – and ahead to what’s next.

Beurs

The opening of the new academic year highlighted students' and lecturers' personal motivators. Incoming students were encouraged to be bold, forge their own paths and grow by trial and error.