Professor Castermans has been a Professor of Private Law at the Institute for Private Law since 1 September 2007.

More information about Alex Geert Castermans

Studies

• Private Law, Leiden University (LL.M. 1980-1985)
• PhD, Leiden University (1985-1992)

Title of dissertation / oration / key publications

• The duty to disclose during negotiations, Leiden 1992.
• The Citizen in the Civil Code (or the features of pear juice), Leiden 2008.
• The legal liability of Dutch parent companies for subsidiaries’ involvement in violations of fundamental, internationally recognised rights, Leiden 2010.
• Corporations for human rights,  European Company Law, 2010/7.
• Towards a European Contract Law through Social Dialogue, European Review of Contract Law, 2011/7.
• The General Concept of Concurrence Applied to European Insolvency Law (with Ruben de Graaff). In: Santen B.P.A., Offeren D.H. (Ed.) Perspectives on international insolvency law: a tribute to Bob Wessels. Deventer: Kluwer 2014. 27-49.
• The Digital Single Market and Legal Certainty: A Critical Analysis (with Ruben de Graaff & Matthias Haentjens), . In: Colombi Ciacchi A. (Ed.), Content and Effects of Contracts - Lessons to Learn From The Common European Sales Law. Studies in European Economic Law and Regulation no. 7. Cham: Springer International Publishing 2016. 45-72.
• The PETL and corporate liability for greenhouse gas emissions: duties and remedies, Journal of European Tort Law 2024/15(1): 63-83.
• The potential of contractual assurances to advance supply chain due diligence (with Jaap Baaij). In: Jong E.R. de (Ed.), Corporate accountability and liability for climate change. Elgar Studies in Climate Law. Cheltenham: Edward Elgar 2024. 110-141.
• The Dutch Preliminary Ruling Procedure in the light of the European Directive on Representative Actions (with Bart Krans & Marije Ploum), International Journal of Procedural Law 2024/14(1): 125-147.
• Climate liability: a duty of care for companies (with Bart Krans & Joska Lukkes), Juristenzeitung 2025/ 80(22): 1022-1028.

Expertise 

Alex Geert Castermans is interested in the interaction between European law and Dutch private law (contract law, tort law) as well as the interaction between national private and public law. Every day, cases demonstrate how difficult it is to reconcile rules from both international and national sources. Several of his publications have focused on corporate social responsibility.

Publications

Activities