Professor Nico Schrijver is professor of public international law at Leiden University and currently the president of the Institut de Droit international /International Law Institute, the most prestigious international law institute which was established in 1873 and which for the quality of its work…

The UN International Law Commission was established soon after the Second World War with the mandate to promote the progressive development of international law and its codification. It is a subsidiary organ of the UN General Assembly.

The Public Prosecution Service in the Netherlands is examining the possibility to prosecute Dutch national Jitse Akse on the suspicion of the multiple murder of Islamic State fighters. As a foreign fighter Akse joined the Kurdish militia YPG in its armed struggle against the Islamic State.

Yvonne Erkens, Associate Professor at the Department of Labour Law and Social Security co-organised a symposium entitled ‘Misdirected allegations of breaches of research integrity’ with Frits Rosendaal (LUMC) and Ivan Oransky (Retraction Watch) at the World Conference on Research Integrity. The conference,…

Few events have influenced our global order as intensely as the events of September 11, 2001.

The following students have been part of LAPP:

Vacancies at the Department of Economics

These are our lecturers (in alphabetical order) for the 2025 Summer School in Languages and Linguistics.

On 7 May 2020, Jolanda van der Vliet defended her thesis 'The International Legal Protection of Environmental Refugees. A human rights-based, security and State responsibility approach'. The doctoral research was supervised by Prof. N.J. Schrijver and Prof. J.J.C. Voorhoeve.

This dissertation assesses the influence of British Celtic on the phonological development of English during and shortly after the Anglo-Saxon settlement period, ca. AD 450-700.

On Friday 17th September 2021 an inaugural lecture was held by prof.dr.ing. Bram Klievink entitled: 'Hollen én stilstaan: hoe data en digitalisering de overheid veranderen'.

Onlangs verscheen het boek ‘Afgrond zonder vangnet’ van Yra van Dijk, hoogleraar Moderne Nederlandse Literatuur. In haar boek analyseert ze verschillende thema's in het werk van Arnon Grunberg.

The findings in this thesis improve the understanding of 1) the relationship between exposure characteristics and toxicity of ENPs, 2) the joint toxic action of ENP mixtures and the comparison to metal salt mixtures, 3) how NOM affects the individual and joint toxicity of ENPs, 4) the extent of trophic…

International organisations that represent collaborations between States are becoming increasingly more powerful, and they have an increasing impact on our daily lives. For example, the European Court of Human Rights in Strasburg established that minors have a right to legal aid immediately following…

Fate and toxicity of copper nanoparticles was related to the water chemistry of the environment and pristine size.

Throughout its existence, the Telders Competition has enjoyed the support of several prominent members of the ICJ and the international legal world.

On 11 November 2021, Evelien Campfens defended the thesis 'Cross-border Claims to Cultural Objects'. The doctoral research was supervised by Prof. N.J. Schrijver and Prof. W.J. Veraart (VU Amsterdam).

In this paper, Sarah Giest and Bram Klievink highlight the effects of AI implementation on public sector innovation. This is explored by asking how AI-driven technologies in public decision-making in different organizational contexts impacts innovation in the role definition of bureaucrats.

Over the past years it has been discovered that the population of extra-solar planets is large and diverse.

MetaROR is an open peer review platform based on the publish–review-curate model and aims to improve the dissemination and evaluation of metaresearch.

The Public Policy and Innovation department of the Institute of Public Administration focuses on shaping, implementing, and evaluating policy through innovative approaches. Our goal is to tackle complex societal challenges by exploring technological advancements and creative policy tools.

On 25 September 2019, Luuk Esser defended his thesis 'De strafbaarstelling van mensenhandel ontrafeld'. The doctoral research was supervised by Prof. C.P.M. Cleiren and Prof. J.M. ten Voorde.

On 27 June 2019, Vid Prislan defended his thesis 'Domestic Courts in Investor-State Arbitration: Partners, Suspects, Competitors'. The doctoral research was supervised by Prof. dr. N.J. Schrijver.

On 16 June 2020, Andrea Varga defended her thesis 'Establishing State Responsibility in the Absence of Effective Government'. The doctoral research was supervised by Prof. N.J. Schrijver and Prof. F. Baetens (University of Oslo).

In the master’s programme in Archaeology, you can follow courses on the archaeology of Europe, deepening your understanding of the continent’s long history.

More on the Dutch webpage.

Which intervention technique is more effective in reducing public speaking anxiety in children aged 9 – 12 years, exposure or restructuring cognitions?

Promotor: J.M. van Ruitenbeek, Co-Promotor: S.J. van der Molen

Big data promises to transform public decision-making for the better by making it more responsive to actual needs and policy effects. However, much recent work on big data in public decision-making assumes a rational view of decision-making, which has been much criticized in the public administration…

Assessing the risks of engineered nanomaterials (ENMs) solely on the basis of experimental assays is time-consuming, resource intensive, and constrained by ethical considerations (such as the principles of the 3Rs of animal testing). The adoption of computational toxicology in this field is a high p…

The research described in this thesis shows that hypercholesterolemia, a well-established risk factor for atherosclerosis, can impact skin lipid pool and barrier function already at young age. In the field of atherosclerosis, we showed that the small peptide Lyp-1 can be used as a targeting molecule…

Electron microscopy has become an extremely important techniquein a wide variety of elds.

Blood, Sweat and Tears: The Changing Concepts of Physiology from Antiquity into Early Modern Europe

Below you will find an overview of the publications of The Leiden Advocacy Project on Plastic.

To facilitate and accelerate a systemic change in society by creating a framework based on the current post-growth narratives, policies, and initiatives.

In films kunnen de meest wonderlijke acties plaatsvinden. Maar zijn die acties in de 'echte' wereld ook mogelijk? En in hoeverre houden filmmakers ons voor de gek? Tijdens het Leiden International Film Festival komen film en wetenschap samen.

Duizenden metaalvondsten die door detectorzoeker wijlen Herman Zomerdijk zijn gedaan in de regio Kennemerland schetsen een uniek beeld van Noord-Holland door de eeuwen heen. Hij zocht en verzamelde decennialang historische metalen objecten in Noord-Holland en bouwde zo een unieke metaalcollectie op.

Mattias Brand defended his thesis on 10 April 2019

The data-driven economy allows for the collection and processing of large amounts of data. Such data can be used to optimize profits by (dynamically) differentiating prices for different consumers.

This research sets out to answer the following questions:

On 12 November 2019, Larissa Koupriuchina defended her thesis 'Judgmental Adjustments in Revenue Management'. The doctoral research was supervised by Prof. J.I. Van der Rest.

We would all like to live in a world in which individuals feel safe, conflicts are resolved peacefully and the interests of future generations are taken into consideration. At Leiden University legal scholars investigate to what extent public international law meets the needs of a globalised society.…

Philology and Manuscripts from the Muslim World

The starting point for this research project is the notion that the human brain is susceptible to all kinds of fallacies and biases that affect our perceptions and influence our reasoning outside of our conscious awareness. Indeed, most people think they are merely observing facts and that they process…