Doing your taxes, Netflixing or driving a car: more and more daily activities are supported by computer applications. It is challenging and expensive to test software thoroughly, leading to errors in most applications. PhD candidate Benjamin Lion made a mathematical framework to deal with this problem.…

A new class of polymers has been used in patients for the first time. The compound is the first new drug solubilising agent in decades. Introduced in 2014 by chemist Matthias Barz from Leiden University, it offers a unique alternative to current options.

From spiders in the bathroom to mice in the kitchen, we share our homes with far more species than we realise (whether we like it or not). Researchers at Leiden University and the University of Helsinki are collecting stories about how people live alongside these non-human housemates.

When Robin Hartman walks through or around the buildings of the Faculty of Science (FWN), he’s always alert. He looks up, around, and behind him, constantly aware of his surroundings. As the head of emergency response (BHV), the safety of staff and students is his top priority.

Each year a staggering 18 billion chickens, turkeys, pigs, sheep, goats, and cows either die or are killed without making it onto someone's plate. Environmental scientists Juliane Klaura, Laura Scherer, and Gerard Breeman were the first to calculate this number on a global scale. 'Reducing these numbers…

A microscope with incredible sharpness that leaves samples unharmed – Guido Stam helped develop one. During his PhD research, he combined light and electrons to study biological samples. ‘We can now measure things that simply weren’t possible before.’

You can activate and manage your account via Account Services. To make the best use of Account Services, it is important that you set your account properly the first time you use it.

If hackers are after your password, it won’t take them long to guess it if it’s simple. In a split second, they can crack passwords with numbers or words that appear in the dictionary. They can then use that one password to access everything; they can get into your email accounts or make online purchases.…

If you relocate for your work or if the University requires you to move, you may qualify for a relocation allowance or bonus.

If you cycle to work, you can use the University’s bicycle racks or lockable bicycle sheds; to use a lockable shed, however, you need a bicycle pass. At some locations you can also borrow a staff bicycle.

The following privacy and security guidelines must be adhered to when using Maileon.

Using secure tools ensures that information and personal data are well protected. ‘Tools’ refers to software that can help you perform your work efficiently, such as email software or a file-sharing system. To quickly see whether a specific tool is permitted, check the tool picker!

Arts and leisure, Arts and leisure

Regardless of whether you work at a desk or in a lab, all workplaces have their risks. As your employer, the University aims to create a healthy workplace and to limit possible health risks. Here you will find the main risks and measures that we take to reduce them.

Here you will find guidelines for using devices such as laptops, tablets, and telephones. Whether you are working with a device purchased for you by ISSC or with a device you have purchased privately, it is important that you save your files securely and handle confidential data with care.

DataKompas is our new tool for strategic and policy related information. It includes data from our educational and research activities, staff members, management, partnerships and the implementation of our strategic plan. These singular and numerical facts offer us a complete overview and a factual…

You think you can spot a phishing scam: a suspicious email that asks for your password or other personal data. But these emails are becoming increasingly plausible, so you could still fall into the trap. That’s why this method is still used so often by people with malicious intent. Did you know that…

Curious to find out how you can contribute to a safe working environment? Then keep reading to discover our tips for working securely. They will help you to work more safely in specific situations. This section contains tools and tips to promote safe working habits in specific situations.

Curious to find out how you can contribute to a safe working environment? Then keep reading to discover our tips for working securely. They will help you to work more safely in specific situations. This section contains tools and tips to promote safe working habits in specific situations.

When you decide to move to the Netherlands and bring along your family there is a great deal that needs to be taken care of. We will provide some information on schools, childcare and learning Dutch to help you settle in in the Netherlands.

All staff are entitled to a workplace free from unacceptable behaviour such as bullying, sexual harassment, intimidation, discrimination and violence at work. The same applies to integrity issues such as theft or a conflict of interest. If you experience or witness such behaviour or suspect a breach…

The Prospectus contains an overview of all study programmes and courses offered by Leiden University. It is important to keep the information about your course up to date.

We all occasionally receive an email from an unknown sender, with content we weren’t expecting or that raises our suspicions in some other way. This is usually a fake email, also known as a phishing email. In fact, there are various types of phishing: it can also be done over the phone.

Leiden University uses Security staff for access control and large or sensitive events.

Making use of social media is a good way to meet others or to hear about the latest news and developments. But it also has its downsides: disinformation, trolling, disrespectful comments and even the misuse of (personal) data.

If you’re working on a PhD track and are experiencing psychological issues, you can contact one of the psychologists for PhD candidates for help with problems that have arisen during the PhD process or are directly affecting this.

Here you can find questions and answers about the employee experience survey.

There are many tributaries to Rosalin Kuiper’s story and they all lead to the sea. The 28-year-old sailor was one of the five-person Team Malizia in the world’s most prestigious sailing competition: the Ocean Race.

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.’

A new LUMC study has changed our understanding of how cells work. Researchers have discovered that the CFAP20 protein acts as a kind of ‘traffic controller’ on DNA. Without this protein, chaos ensues, potentially causing cancer. Their findings have been published in the prestigious journal Nature.

Do you know what to do if a rubbish bin catches fire, a student takes ill or a colleague falls off their bike? Our emergency responders do. They are ready to evacuate buildings, fight fires and offer first aid. Why not join the team?

What exactly does it mean when your doctor says you have a ‘good chance’ of survival? Leiden researchers discovered that there is a big difference in how people interpret such probability phrases. And that can be a problem, warns lead researcher Sanne Willems in her blog post.

The JUL board 2025/2026 consists of five colleagues:

Within our university, we believe it is important to remain in dialogue with each other, to hear what is going on, and to take steps together. This allows us to build an environment in which we can work and grow together.

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.

Maileon statistics give you insight into the success of your email campaigns. How often was an email opened, which links did recipients click on and how many unsubscribes were there? With that data, you can optimise your campaigns.

Follow these steps to start a new mailing or newsletter.

Are you a PhD candidate, and is there something you’d prefer to discuss with someone other than your thesis director or supervisor? The confidential counsellor for PhD candidates is here to help. You can speak to him/her in confidence and receive advice. If you experience symptoms of physical or mental…

Leiden University is committed to creating a pleasant working environment for its staff. It may nevertheless happen that you find yourself unable to work due to a temporary or long-term illness or disability. The university occupational health physicians can help you reduce health risks and give you…

Leiden University is committed to creating a pleasant working environment for its staff. It may nevertheless happen that you find yourself unable to work due to a temporary or long-term illness or disability. The university occupational health physician can help you reduce health risks and give you…

Anne Land has been working at Science Communication & Society — the department that researches and teaches science communication — for fourteen years. What makes her work special? ‘That moment when students suddenly realise: this is exactly what I want to do.’

End Fossil, Open Leiden and Students for Palestine incorrectly claim that a meeting will be held with the Executive Board on Friday 11 April. This statement is to correct these claims and clarify the situation.

How to take ownership of your career? To find out, students from ‘Design Your Career as a Climate Change Maker’ visited a farmer who has done just that. They learned from him that it’s never too late to start working on something you believe in.

Her father is a miller, so it’s hardly surprising that Esther van der Ent is also fascinated by windmills. Alongside her work at the Centre for Environmental Sciences (CML) and the Leiden-Delft-Erasmus alliance, Esther is now training to become a miller herself. ‘This craft mustn’t be lost,’ she say…

Today marks the launch of the LDE Bachelor Honours Programme Sustainability. Students from Leiden University, TU Delft and Erasmus University will work together on concrete sustainability issues of organisations. Interest in the new programme turned out to be overwhelming. Two lecturers involved share…

Nine students dove into a challenging iGEM project this summer. With their idea, they aim to make antibodies more efficient - and in the meantime learn at least as much about collaboration, creativity and their own future.

Assistant professor Joost Willemse firmly believes that as a teacher, you’re never done learning. ‘Students ask questions about things you’ve never thought of yourself. Ultimately, that makes you better at your job.’ That’s why he always encourages his students to ask questions. And it’s appreciated:…

‘A Muslim and a Jew in the house of God.’ This is how historian Nadia Bouras introduced her recent conversation with colleague Sara Polak in Leiden’s Hooglandse Kerk. They discussed the rising tensions since the outbreak of the Israel-Hamas war. ‘Dare to ask each other questions.’