SSH/DRT Faculté de droit et de criminologie (DRT)
SSH/JURI Institut pour la recherche interdisciplinaire en sciences juridiques (JUR-I)
SSH/JURI/PJPU Droit public (PJPU)
Highly curious and versatile academic motivated by providing a well rounded analysis of legal issues arising from public decision-making processes, in general and in particular where public, private and intermediary (eg ONGs, civic organisations, families etc.) groups interact (either collaborative or competitively).
Seeking to map administrative normativity and to pin down how an ethics of care may shape administrative action in case of moral dilemma's (especially in the case of scarce resources or planetary boundaries).
Réseaux sociaux
Yseult is a Professor at the Louvain Law School with expertise in comparative public economic law in Europe. She teaches the law of public finances and law and economics at UC Louvain (2022-), French public law (Essex 2010-), and administrative real estate law (ULB 2022-2025). She holds a PhD from Cambridge (2011) and law degrees from the Facultés Universitaires Saint-Louis (Candidatures, FUSL), the Université libre de Bruxelles (Licences, ULB) and the Vrije Universiteit Brussels (Licenciaat notariaat, VUB). She is a research associate at the Centre de droit Public of the ULB (BE, 2009-) and the Centre Montesquieu d'Etudes de l'Action Publique (BE, 2022-). She was a Fellow of the Deutsches Forschungsinstitut für Öffentliche Verwaltung (Speyer, 2016-2023) and is a Fellow of the Westminster Abbey Institute (UK, 2023-). Yseult develops her academic expertise in two main legal fields, with a keen interest for interdisciplinary collaboration and input from history, ethics, economics/organisational theories and political philosophy.
1/ Law of public finances at all levels of governance (international, European, national, local)
Yseult is one of the founding members of the Research Network on Public Authorities in Financial Distress. With Eugenio Vaccari, Laura Coordes and Geo Quinot, she is the co-author of a book on Municipalities in Financial Distress : An Environmental, Social and Governance Critique (foreword by Martin Loughlin, Edward Elgar 2025, open access). With Eugenio Vaccari, she is co-editing a book on Local Government and the Territorial Constitution – Social Justice and Local Finances in the UK (foreword by Stephen Bailey, Bristol University Press forthcoming 2026, open access). She co-edited a special issue on solidarity in times of crisis at EU level with Theodore Konstadinides and Esin Küçük for the Maastricht Journal of European and Comparative Law (open access). Her book Public Private Partnerships and the Law - Regulation, Institutions and Community (Edward Elgar 2014) was shortlisted for the 2015 Birks Prize from the Society of Legal Scholars (UK).
An on-going project includes a Commentary of the EU Directive 2014/24 on classic procurement (with Kris Wauters and Laurent Coutron, in French, Larcier, planned publication early 2026). With Frederic De Wispelaere (KULeuven/HIVA), she is mapping the data available on the access for SMEs to subcontracting in the construction sector and developing policy recommendations to improve it (contract awarded by the SPW / service public wallonie, Observatoire wallon de la commande publique, 2025).
Yseult's approach to the law of public finances builds on her keen interest for public economic law and the allocation of scarce resources (such as money, soil, water or clean air), and she is interested in how public entities spend taxpayers' money for the public good through big infrastructure projects (eg water infrastructures) or how they collect money in innovative ways to sustain their activities. In particular, the borderline between public finances and repression is one of the lines of inquiry she pursues both at EU and at local levels. She connects this question to the tensions arising in the realm of social justice, especially between enforcing public policies and an ethics of care. In addition, a reflection on the different conceptions that decision-makers of the time and space dimensions of their decisions and investments enriches her teaching and research.
2/ Comparative public law in Europe
Yseult develops a strand of research pertaining to comparative public law in Europe thanks to her participation in a number of international projects, such as the one led by Giacinto della Cananea on the common core of European administrative law, by Ulrich Stelkens on the pan-European principles of good administration, or by Stephane de la Rosa on the principles of procurement. She authored the entry on administrative courts in the Edward Elgar Encyclopedia of Comparative Law, and a chapter on administrative justice and the rule of law in the Oxford Handbook on Administrative Justice. She co-authored an overview of comparative administrative law with Mariolina Eliantonio for the Maastricht Journal of European and Comparative Law and contributed a chapter comparing the European Union and the Council of Europe for Comparative Administrative Law - New Voices (edited by P Lindseth et al, Edward Elgar forthcoming) with Ulrich Stelkens. She co-edited a special issue of REALaw on resistance to transplants in the European administrative state with Emmanuel Slautsky and she is co-editing (with Radosveta Vassileva) a special issue on networks and friendships during the Interwar period.
On-going projects include the updating and expansion of the second edition of the Casebook on Texts and Materials - Judicial Review of Administrative Action (two volumes, with Mariolina Eliantonio - under contract with Hart, planned publication 2026), the co-edition of a book on Pan-european principles of good administration (two volumes, with Ulrich Stelkens - under contract with Brill, planned publication 2026, open access), a co-authored book on Comparative Judicial Review: Principles, Core Questions and Beyond (with Maurice Sunkin, Oren Tamir and Paul Daly - under contract with Edward Elgar, planned publication 2029); and a co-edited Traité de droit administratif transnational (Bruylant in French with Jean-Bernard Auby, Emilie Chevalier and Olivier Dubos).
Yseult is a general reporter for the 2026 International Academy of Comparative Law in Berlin (on digitalisation of legal teaching, with Enguerrand Marique) and a national reporter for the same conference on the use of foreign law by the administrative judge (with François Lichère as the general reporter). She contributes to the Intergovernmental relations project carried out by Johanne Poirier (McGill) and to the Edward Elgar Encyclopedia on Local Government (edited by Edwin Benton and John Kincaid).
Yseult is especially interested in differentiation processes, narratives, linguistic mapping and cognitive mindsets across legal and administrative epistemic communities. She explores these matters in specific administrative law related-topics such as principles of judicial review, procurement, effective judicial protection, ethical standards in the civil service, bias, deference, climate change and intertemporal equity. Yseult has been the recipient of a British Academy/Leverhulme Trust small research grant (2013-2015), a ESRC - Essex Impact Acceleration Account grant (2016), a SLS small project grant (2017-2018), a British Academy Rising Star Engagement Award (2016-2017) and a European Central Bank Legal Research Programme Award (with Emmanuel Slautsky 2025).
An associate member of the International Academy of Comparative Law and the Belgian representative for the Group of Independent Experts to the Charter of Local Self-Government, (Council of Europe), Yseult is one of the co-leads of the Law and Administration strand at the European Group of Public Administration (2024-). She is the co-editor-in-chief of the Louvain Law Review (formerly Annales de droit de Louvain, 2025-) and sits on the editorial board of REALaw and in the advisory boards of comparative and European law journals (European Public Law, Hungarian Yearbook of International Law and European Law (2020-2025), Central European Public Administration Review (CEPAR), Droit Public Comparé - Comparative Public Law, French Yearbook of Public Law) and Revue de fiscalité régionale et locale (2025-). Yseult welcomes queries and submissions for REALaw.blog and the Yale Comparative Administrative Law mailserv.
For a Q&A with Yseult and her passion for comparative public law, please click here.
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Yseult welcomes inquiries for doctoral and post-doctoral supervision and for supporting applications to the MCSA post-doctoral fellowship on topics pertaining to her research interests.
Marique, Yseult. Budget Conditionality Judgments – A Virtuous Circle of Solidarity to Overcome Moral Hazard?. In: Maastricht Journal of European and Comparative Law, (2024).
Marique, Yseult. EU Finances in 2019-2024: Incremental Constitutional Reshaping?. In: Louvain Law Review, Vol. 2024, no.2, p. 185-211 (2025).
Marique, Yseult. Parlez-vous le droit administratif transnational?. In: L'Actualite Juridique. Droit Administratif, Vol. 2025, no.42, p. 2173 (2025).
Marique, Yseult. Comparative administrative law in Europe: state-of-the-art overview and research agenda. In: Maastricht Journal of European and Comparative Law, (2024). doi:10.1177/1023263X241252105.
Marique, Yseult. 'Transnational Climate Change Law – A Case for Reimagining Legal Reasoning?. In: French Yearbook of Public Law, Vol. 1, no.1, p. 69 (2023).
Rizcallah, Cécilia ; Marique, Yseult. Article 47 of the Charter of Fundamental Rights: A Fruitful Tree Growing in the Belgian Landscape of Judicial Protection. In: REALaw.blog, Vol. 1, no.1, p. 1 (2023).
Marique, Yseult. Toward a Model Law for the Treatment of Distressed Local Public Entities. In: Chicago-Kent Journal of International and Comparative Law, Vol. 98, no.2 (2023) (Accepté/Sous presse).
Marique, Yseult. ‘Collectivity and Equality (Pari Passu) in the Treatment of Local Public Entities in Distress’ . In: International Insolvency Review : journal of the international association of insolvency professionals, Vol. 32, p. 93 (2023). doi:10.1002/iir.1494.
Marique, Yseult. 'The Politicisation of the UK Civil Service: Causes, Manifestations and Evolutions’. In: Revista Catalana de Dret Public, Vol. 65, p. 93-111 (2022). doi:10.2436/rcdp.i65.2022.3879.
Marique, Yseult. Le principe de légalité en droit administratif anglais - Un concept "flou" face aux transformations de l’action administrative. In: Revue Française de Droit Administratif, Vol. 2, no.5, p. 241 (2022).
Marique, Yseult. Resistance to Transplants in the European Administrative Space - An Open-Ended Reading of Legal Changes. In: Review of European Administrative Law, Vol. 14, no.1, p. 7-36 (2021) (Soumis).
Marique, Enguerrand ; Marique, Yseult. Sanctions on digital platforms: Balancing proportionality in a modern public square. In: Computer law and security review, Vol. 35, no. 7, p. 13 (2020). doi:10.1016/j.clsr.2019.105372.
Marique, Enguerrand ; Marique, Yseult. Sanctions on digital platforms: beyond the public–private divide. In: Cambridge International Law Journal, Vol. 8, no.2, p. 258-281 (2019). doi:10.4337/cilj.2019.02.05.
Marique, Yseult ; Wauters, Kris. La lutte contre le dumping social dans la sous-traitance de marchés publics. In: Marchés et contrats publics, no. 1, p. 59-90 (2018).
Marique, Yseult ; Steven Van Garsse. Public-private cooperation and judicial review: A case study drawn from European infrastructure projects. In: European Public Law, Vol. 24, no.3, p. 515 (2018).
Marique, Yseult ; Vaccari Eugenio ; Quinot Geo ; Coordes Laura. Municipalities in Financial Distress: An Environmental, Social and Governance Critique , Edward Elgar, 2025. 103531990X (Accepté/Sous presse).
Marique, Yseult. Traité de droit administratif transnational (Droit administratif), Bruylant, 2025. 9782802770688.
Marique, Yseult. Manuel de droit comparé des administrations européennes, Larcier, 2019. 9782802757863.
Marique, Yseult. Access to Justice – Beyond the Policies and Politics of Austerity, 2016. 9781849467346.
EU Directive 2014/24 on public procurement. A new turn for competition in public markets ?, éd. Wauters, Kris ; Marique, Yseult (Marchés et contrats publics – Overheidsopdrachten –en overeenkomsten – Dossiers), Larcier: Bruxelles, 2016. 9782804490454. 230 p.
Marique, Yseult. Public–Private Partnerships and the Law. Regulation, Institutions and Community, Edward Elgar: Cheltenham, 2014. 9781781004555. doi:10.4337/9781781004555.
Marique, Yseult. Comparing International and Supranational European Administrative Law – A Tale of Two Europes. In: Peter Lindseth (ed.), Comparative Administrative Law – New Voices, 2025 (Soumis).
Vander Putten, Norman ; Marique, Yseult. Le nouveau cadre budgétaire européen et ses incidences sur le droit belge. In: Norman Vander Putten (éd.), Actualités en matière de droit des dépenses publiques (UB3), Larcier: Bruxelles, 2025, p. 105-140. 9782807947801.
Marique, Yseult. Les ressources quantitativement limitées – Entre exploitation économique et considérations politiques. In: Van Garsse, Steven (ed.), Concessions and similar instruments in the EU and beyond (Administrative Law), Larcier, 2025. 9782802776307 (Accepté/Sous presse).
Marique, Yseult. The Civil Service in Belgium between Fragmentation and Common Principles. In: European Civil Service, Routledge, 2025 (Soumis).
Marique, Yseult. Administrative Courts. In: Jan M. Smits, Jaakko Husa, Catherine Valcke, Elgar Encyclopedia of Comparative Law, 2023. 9781839105593. doi:10.4337/9781839105609.courts.
Rizcallah, Cécilia ; Marique, Yseult. Article 47 of the EU Charter of Fundamental Rights A Fruitful Tree Growing in the Belgian Landscape of Judicial Protection. In: Mariolina Eliatino, Guilia Gentile, Matteo Bonnelli, Article 47 of the EU Charter and Effective Judicial Protection Volume 2: The National Courts’ Perspectives, Bloomsburry: Oxford, 2023, 7 - 28. 9782802767008.
Marique, Yseult. Ethical standards between law and politics. In: Gromek-Broc, K. (Ed.), Liber Amicorum Patrick Birkinshaw, 2023. 9789403541068.
Marique, Yseult. La responsabilité financière des gestionnaires publics en Angleterre – Vers une culture administrative répressive?. In: Damarey, Stéphanie, Responsabilité financière des gestionnaires publics - Approches internationales, Mare et Martin, 2023. 978-2-84934-713-3.
Marique, Yseult. Administrative Justice and the Rule of Law. In: Marc Hertogh (ed.), Richard Kirkham (ed.), Robert Thomas (ed.), Joe Tomlinson (ed.), The Oxford Handbook of Administrative Justice, 2022. 9780190903091. doi:10.1093/oxfordhb/9780190903084.013.16 (Soumis).
Marique, Yseult. Les missions de contrôle de l'administration de l'Union européenne. In: Jean-Bernard Auby & Jacqueline Dutheil de la Rochère, Traité de droit administratif européen, 2022. 9782802764281.
Marique, Yseult. ‘Collateral challenge in England and Wales: More questions than answers’. In: Drago, D. and Eliantonio, M., Indirect Review in Europe, 2022. 9781003164302.
Marique, Yseult. ‘Legal, economic and managerial principles in English public contracts – Degrees in normativity and effectiveness’. In: Stéphane de La Rosa, Patricia Valcarcel Fernandez, General Principles of Public Contracts in Europe, 2022. 9782802767633.
Marique, Yseult. The Administration and the Judge: Pragmatism in Belgian Case Law (1890–1910). In: Giacinto della Cananea et Stefano Mannoni (eds), Administrative Justice "Fin de siècle". Early judicial standards of administrative conduct in Europe (1890-1910), Oxford University Press: Oxford, 2021. 978-0-1988-6756-2. doi:10.1093/oso/9780198867562.003.0003.
Marique, Yseult. Belgian Pluralism and Pragmatism - Shared Principles in a Strained Relationship. In: Ulrich Stelkens et Agnė Andrijauskaitė, Good administration and the council of Europe: law, principles, and effectiveness, Oxford University Press, 2020. 0-19-886153-2.
Marique, Enguerrand ; Marique, Yseult. Power beyond the public-private divide on digital platforms. After laissez-faire, time for organised checks and balances. In: Bani, E.; Pachuca-Smulska, B.; Rutkowska-Tomaszewska, E., Public and Private Law and the Challenges of New Technologies and Digital Markets. Volume I. Regulatory Challenges (Monografie Obcojęzyczne ), CH Beck: Warsaw, 2020, p. 129-152. 978-83-8198-070-8.
Wauters, Kris ; Marique, Yseult. The fight against social dumping in the subcontracting of Belgian public procurement. In: Marcel Szabo, Petra Lea Lancos, Reka Varga (eds.), Hungarian Yearbook of International and European Law 2018, Eleven Internationbal Publishing, 2019, p. 403-436. 9789462369535.
Marique, Enguerrand ; Marique, Yseult. Uber in London: A battle between public and private regulation. In: Rozen Noguellou, David Renders (eds.), Uber & Taxis (Comparative Law Studies), Bruylant: Bruxelles, 2018, p. 163-202. 9782802762263.
Marique, Yseult. Integrity in English and French public contracts: Changing administrative cultures?. In: Jean-Bernard Auby, Emmanuel Breen et Thomas Perroud, Corruption and conflict of interest, 2014, 85-112. 9781781009345.
Marique, Yseult. Independent fiscal boards: a case study for new challenges for comparative law. Comparative law today: digging trenches, brid (Cambridge, King's College, du 07/07/2025 au 08/07/2025).
Marique, Yseult. Independent supervision, ESG and accountability. EUROPEAN CENTRAL BANK, LEGAL RESEARCH PROGRAMME (Frankfurt, 03/09/2025).
Vander Putten, Norman ; Marique, Yseult. Le nouveau cadre budgétaire européen et ses incidences sur le droit belge. Formation UB3: Actualités en matière de droit des dépenses publiques (ULB Bruxelles, 10/02/2025).
Marique, Yseult. Statement on Ombudsman oversight of the semi-private and semi-public administration. EUROPEAN NETWORK OF OMBUDSMAN - Upholding a rights-based Europe (European Parliament, du 20/11/2025 au 21/11/2025).
Marique, Yseult. ‘(Trans)formation des états via les dépenses militaires – Relecture des récents budgets européens et belges’. Les rapports entre droit public de l'économie et économie de marché (UNIVERSITE LIBRE DE BRUXELLES, Centre de droit public et social, 11/12/2025).
Rizcallah, Cécilia ; Marique, Yseult. Article 47 of the EU Charter of Fundamental Rights A Fruitful Tree Growing in the Belgian Landscape of Judicial Protection. Workshop: Article 47 of the EU Charter and effective judicial protection (Maastricht University (Online), du 24/09/2021 au 25/09/2021).
Rizcallah, Cécilia ; Marique, Yseult. L'article 47 de la Charte des droits fondamentaux dans l'ordre juridique belge. Midi du CIRC (Online, 11/06/2021).
Marique, Enguerrand ; Marique, Yseult. Sanctions on platforms beyond the public/private divide. 8th Annual Cambridge International Law Conference: 'New Technologies: New Challenges for Democracy and International Law (Cambridge, UK, du 20/03/2019 au 21/03/2019).
Marique, Enguerrand ; Marique, Yseult. Sanctions on platforms: a test case for balancing legal and social norms in individualized decisions. 2019 Internet Governance Forum (Berlin, du 25/11/2019 au 28/11/2019).
Marique, Enguerrand ; Marique, Yseult. Conceptualizing powers on platforms beyond the public / private divide. Public Law and the Challenges of New Technologies and Digital Markets (Bergame, Italie, 26/09/2018).
Marique, Yseult ; Derard, Leana. Article 42 - Technical specifications, in Evaluation of the 2014 public procurement directives. Answer to the call of evidence Ref. Ares(2024)8928678 (), 2025. p. 22-25 p.
Marique, Yseult. Local Public Entities in Distress: A Global Study, 2022.