Methoden van rechtswetenschappelijk onderzoek: wat vermag de menselijke waardigheid?, Afscheidssymposium Ernst Hirsch Ballin, Universiteit van Tilburg 13 mei 2022

Towards a Universal Declaration of Human Responsibilities and what the Acquisition of Movable Goods has to do with it, lecture Conference Back to the Future of Property Law, Maastricht 21 April 2022

Why Law and Popular Culture?, lecture Roundtable Law and Popular Culture III, Maastricht 18 June 2021

What can Hip Hop Music teach the Law?, Maastricht Law Open Air Festival, 18 May 2021

Harmonisation of law in the face of economic nationalism, online lecture Dutch Science Talks, NUFFIC Neso Russia, 7 April 2021

Case Law and Method in the Netherlands, lecture LEAP online webinar Case Law and Case Method in Legal Education, Universitas Airlangga 21 January 2021

Wat is (goed) rechtswetenschappelijk onderzoek en welke rol spelen is en ought daarin?, online SteR-middag Is en Ought in de Rechtswetenschap, Onderzoekcentrum voor Staat en recht, Radboud Universiteit Nijmegen 13 november 2020

Dagvoorzitter en inleiding, Online congres Wat verbindt ons als rechtswetenschappers?, Werkgroep Rechtswetenschap 24 september 2020

Differences between Indonesian and Dutch Contract Law, lecture Universitas Airlangga, Surabaya 15 October 2019

The Dutch Civil Code: on Open Norms in Tort and Contract, lecture Universitas Airlangga, Surabaya 14 October 2019

Current challenges to legal scholarship, lecture seminar Current Challenges to European Legal Scholarship, University of Bergen 25-26 March 2019 

Transnationalisation and legal research, PhD seminar University of Helsinki, 15 March 2019

Legal transplants in private law, lecture Workshop How Countries Learn to Tax, Lorentz Center, Leiden 25 February 2019

De toekomst van multidisciplinair onderzoek, lezing werkconferentie Raad van Decanen, Utrecht 24 april 2018

On legal method, lecture Research Master in Law, Utrecht University, 21 March 2018

Jurist 2068: naar een andere juridische opleiding, lezing landelijke onderwijsdag Nederlandse juridische faculteiten, Maastricht 19 januari 2018

The European Model Companies Act as a Regulatory Tool, lecture workshop Company Law, 22nd Ius Commune conference, Utrecht 23-24 November 2017

Panel, Graduate Studies conference The World of Interdisciplinary Research, Maastricht 27 October 2017

l’Avenir de la recherche en droit, keynote lecture, 200. Anniversaire des Facultés de Droit de  Gent et Liège, 20-21 Septembre 2017

Zestig jaar Baris/Riezenkamp: een feestrede, jaarvergadering NTBR, Utrecht 12 mei 2017

Codification: a Dutch Perspective, MEPLI Round Table Re-De-Co-dification: New Insights on Codification of Private Law, Maastricht 12 May 2017

Bij het scheiden van de markt... Over een privaatrecht zonder de EU, lezing KNAW-UM bijeenkomst Nederland uit de EU: wat kost ons dat?, Maastricht 9 maart 2017

Nederlands recht in vergelijkend perspectief, gastcollege Universiteit Leuven, 7 maart 2017

Laudatio, Uitreiking De La Court Prijs 2017, OBA Amsterdam, 13 februari 2017

On Law and Technology, lecture Innovating Legal Studies and Practice 2017 Winter School, Collegio Ghislieri and University of Pavia, 8 February 2017

Introduction, Round Table conference What is Private Law For?, Maastricht 16 December 2016

The Mind and Method of the Legal Academic, lecture PhD conference University of Lapland, Rovaniemi 17-18 November 2016

Indispensable companions: law and the comparative method, lecture national PhD conference on legal science (DNDS), University of Tromso, 25-26 October 2016

Introduction, lecture Alternative Approaches to Legal Convergence, UM-HiiL-Chair Round Table, 5 October 2016

Introduction, workshop Optional Instruments of the European Union, UM-HiiL-Chair and MEPLI, Maastricht 13 May 2016

Valorisatie en rechtswetenschap: een paradox, lezing symposium Valorisatie: bedreiging of stimulans, Erasmus Universiteit Rotterdam 11 maart 2016

Conformity and remedies in distance salesof tangible goods, lecture Workshop on New Rules for contracts in the digital environment, Juri Committee European Parliament, Brussels 17 February 2016

The European Codification Movement and the Information Society, lecture conference The Making of Civil Codes, University of Torino 15-16 February 2016

Do Small Jurisdictions have a more Complex Law?, lecture conference Small States in Europe, Queen Mary University of London, 13 January 2016

Conclusions, conference The Reform of the Regulatory State: Resilience in Times of Crisis, Maastricht University 12 January 2016

Introduction and chair, The State of European Integration, 20th Ius Commune conference, University of Leuven, 27 November 2015

European Contract Law, guest lecture course Methodology of Comparative Law, Utrecht University 7 October 2015

Verschillen tussen Belgische en Nederlandse rechtsordes en invloed op de juridische terminologie, lezing Interinstitutionele Contactdag Nederlandse vertaaldiensten bij de Europese Unie, Luxemburg 5 oktober 2015

Introduction, MEPLI-HIIL Round Table on Consumers without borders, Maastricht 25 September 2015

Revision of Tort Law in Armenia, lecture Council of Europe-EU meeting on the Draft Civil Code of the Republic of Armenia, Maastricht 25 August 2015

The Future of Codification in France and in Europe, Francois Gény talk, Université de Lorraine, Nancy 6 April 2015

Nederlands recht in vergelijkend perspectief, gastcollege Universiteit Leuven 23 maart 2015

Methodology and the ‘Global Legal Paradigm’, lecture seminar Dangerous Methods and the Global Legal Paradigm, Ecole de Droit Sciences-Po, Paris 6 March 2015

Legal Pluralism and Choice of Law: Towards an Alternative Understanding, lecture conference Legal Plurality: cui bono?, University of Tartu 30 January 2015

Kwaliteit van juridisch onderzoek, lezing Eerste Juridisch Jaarcongres Onderzoek, Universiteit van Tilburg 29 januari 2015

Introduction and chair, workshop Comparative Legal History, 19th Ius Commune Conference, University of Edinburgh, 27-28 November 2014

Nationale wetgeving en andere normstelsels, lezing congres Wetgeving in een veranderende wereld, Ministerie van Veiligheid en Justitie, Den Haag 24 november 2014

Innovating Private Law: on Law and Technology, lecture Collegio Ghislieri, University of Pavia, 21 November 2014

Two lectures on European Private Law, Koc University, Istanbul 24-25 October 2014

Corporate Codes and Promissory Language, lecture HiiL-MEPLI Round Table Enforcing Corporate Social Responsibility, Maastricht 17 October 2014

Towards an alternative way of presenting legal materials, lecture conference 200 Years Savigny and Thibaut: the Codification Debate Revisited, Maastricht University, 10 October 2014

International legal education: the Maastricht experience, lecture conference The Transnationalisation of Legal Education, University of Luxembourg, 26-27 September 2014

Avoidance for legal incapacity, lecture conference Setting the Contract Aside: Comparative Perspectives, East China University of Political Science and Law, Shanghai 22 August 2014

Complexity of Law and Size of Jurisdictions: an Experiment, keynote lecture Juris Diversitas annual conference ‘Comparative Law and...’, Aix-en-Provence 17-17 July 2014

Bestaat de rechtswetenschappelijke methode?, lezing KNAW-serie Recht in geding, Amsterdam 7 juli 2014

What are the methods of legal scholarship?, lecture University of Antwerp, 12 June 2014

Reform of Private Law: On Civil Codes and the Rule of Law, lecture conference Reformele privind consolidarea statului de drept in tarile europene, Lucian Blaga University of Sibiu, 5 June 2014

Panel commentator, PhD course on European law, XXVI FIDE Conference, Copenhagen, 28 May 2014

De toekomst van het privaatrecht, oratie TPR-wisselleerstoel, Universiteit Gent, 15 mei 2014

European Contract Law, guest lecture University of Ghent, 7 May 2014

The Future of Private Law, University of Helsinki Law Spring Lecture, 28 April 2014

Nederlands recht in vergelijkend perspectief, gastcollege Universiteit Leuven 10 maart 2014

Inleiding en voorzitter, KNAW-Minisymposium Wie doet wat? Naar een optimale verdeling van bevoegdheden in de EU, Amsterdam 30 januari 2014

Is there a future for legal doctrine?, guest lecture Universität Würzburg 27 January 2014

Panel chair and commentator, conference Nudging in Europe: What can EU Law learn from Behavioural Sciences?, Université de Liège, 12-13 December 2013

Introduction and chair, workshop Empirical perspectives on the Law of Contracts, 18th Ius Commune conference, Maastricht 28-29 November 2013

Law as a Package: on the Limits of Choice, lecture conference Territorial Laws in a Global Era, University of Helsinki 22-23 November 2013

Legal academics and their methods. lecture Utrecht University, 14 November 2013

Quién hace qué?  Sobre la distribuciéon e competencias óptima entre la Unión Europea y los Estados Miembros, lecture Universitat de Lleida, 24 October 2013

Harmonisatie van privaatrecht in de Europese Unie en de rol van rechtsvergelijking hierbij, Universiteit Gent 15 oktober 2013

The European Legal Academic, plenary lecture The Society of Legal Scholars Annual Conference ‘Tis Forty Years Since, Edinburgh 3-6 September 2013

Who Does What? On the optimal distribution of competences among the EU and the member states, lecture The Society of Legal Scholars PhD conference, Edinburgh 2-3 September 2013

The Teaching-Research Nexus in Law, lecture China-EU School of Law conference Legal Education: 21st Century Developments and Perspectives, Beijing 14-15 June 2013

The Empirical-Normative Method in Legal Scholarship, lecture ACCA conference Comparative Law in Contexts, ULB Brussels 26 April 2013

Introduction, Conference Who Does What? On the Optimal Allocation of Competences for the European Union, Bonnefantenmuseum Maastricht 19 April 2013

What do legal academics do? On the aims of legal scholarship, Carl Jacob Arnholm Memorial Lecture, University of Oslo, 11 March 2013

Plurality of Sources or Pluralism in Law?, lecture University of Lund, 14 February 2013

Nederlands recht in vergelijkend perspectief, college Universiteit Leuven 13 februari 2013

De rol en methode van rechtsvergelijking in juridisch onderzoek, lezing Instituut voor Arbeidsrecht, Universiteit Leuven 24 januari 2013

Goals of European Private Law and Better Regulation, lecture MEPLI Round Table ‘Smart‘ Regulation of European Private Law, Maastricht University 18 January 2013

Private Autonomy and Legal Pluralism, lecture conference A Plurality of Pluralisms, University of Lapland, Rovaniemi 14 January 2013

How to Find Principles of European (Private) Law?, lecture conference General Principles of EU Law and European Private Law, Swedish Network for European Legal Studies, Stockholm 8-9 November 2012

Challenges in European Private Law, lecture opening academic year, Maastricht Centre of European Law, 6 September 2012

Introduction and chair, MEPLI Round Table Competition in International Sales Law, Maastricht University, 14 June 2012

Self-Sufficiency of European (Regulatory) Private Law, lecture workshop A Self-Sufficient European Private Law: A Viable Concept?, European University Institute, Florence 4-5 May 2012

The Common European Sales Law and Party Choice: When Will Parties Choose the Proposed CESL?, lecture conference European Contract Law: A Law-and-Economics Perspective, University of Chicago Law School, 27-28 April 2012 blog

The Common European Sales Law Beyond Party Choice, lecture ZEuP-Tagung, University of Würzburg, 3-4 April 2012. Click here for the working paper

Comparing Chinese and European contract law: aspects of methodology, lecture conference Contract Law in China and Europe, Tsinghua University Beijing, 16-17 February 2012 blog

What do nationalists maximise? A public choice perspective on the (non-) Europeanisation of private law, lecture conference Private Law and Nationalism, University of Amsterdam 3 February 2012 blog

[with W. Bull], European harmonisation of intellectual property law: a view from general private law, lecture conference European Methods and Interactions in the Field of Intellectual Property Law, University of Oxford 7-8 January 2012 (blog)

European legal culture: English common law vs. continental dogmatism or something new?, lecture conference Towards a European legal culture, University of Oxford 16 December 2011

Introduction and chair, MEPLI Round Table The Proposed Common European Sales Law: Have the Right Choices been Made?, Brussels campus Maastricht University, 9 December 2011 (blog)

What Future for European Private Law?, guest lecture course Private Law and the Internal Market, University of Amsterdam, 23 November 2011

Towards an interactive and multi-level system of private law for Europe, lecture conference European Legal Method(s) in a Multi-layered Legal Order, Copenhagen Business School, 17-18 November 2011 (blog)

Problems with Uniform Laws, lecture conference Global Challenges of International Sales Law, University of Florida, Gainesville 11-12 November 2011 (blog). Lecture on

Which Private Law for Europe?, lecture ELSA Università degli studi di Trento, 25 October 2011

Introduction and chair, Conference Does Law Matter?, KNAW Amsterdam 21 October 2011

Het recht en de wereld: een causerie over de toekomst van de juridische opleiding, lezing Tijdschrift voor Privaatrecht Dag in het Groen, Ooidonk 3 september 2011

Common Law and Civil Law, 7 lectures in the Postgraduate programme in international and comparative law, FHR School of Law, Paramaribo, 18-26 July 2011 (blog)

The Future of Codification, lecture Conference Civil Traditions, Codifications and Unification, Utrecht University 30 June 2011

Beyond the State Monopoly: Making Law Work in Times of Globalisation, lecture 4th HiiL Law of the Future Conference, The Hague 23-24 June 2011. Interview on

Introduction and chair, 6th Benelux-Scandinavian Symposium on Legal Theory, University of Lapland, Rovaniemi 8-10 June 2011

Introduction and chair, seminar What Role for Property in European Integration?, University of Helsinki 7 June 2011

How to Prepare Students for Global Citizenship?, lecture Center for Transnational Legal Studies, London, 20 April 2011

International Legal Education: Why and How?, lecture International Association of Law Schools (IALS) conference on Teaching, Legal Education and Strategic Planning, University of Buenos Aires, 13-15 April 2011

The State and Private Law: Towards a Pluralism of Authorities, lecture conference Pluralism and European Private Law, University of Exeter, 25 March 2011

Rethinking Private Law: Finding Alternatives for National Institutions, lecture conference Transnational Law: Rethinking Law and Legal Thinking, European University Institute, Florence, 10-11 March 2011

Codification of Private Law: a Functional Approach, lecture University of Helsinki, 13 December 2010

Private Law 2.0: on the Role of Private Actors in a Post-National Society, inaugural lecture Maastricht-HiiL Chair on the Internationalisation of Law, 30 November 2010. Lecture available on  

On the Role of Principles in European Private Law, lecture colloque doctoral ProDoc Les principes en droit Européen, Université de Fribourg 19-20 November 2010

Over de ongekende legitimiteit van een optionele code, lezing Symposium Groenboek Europees contractenrecht: naar een optioneel instrument?, Universiteit van Amsterdam 10 november 2010

The Psychology of the European and Comparative Judge, lecture conference Judicial Decision Making in Civil Law: Determinants, Dynamics and Delusions, Erasmus University Rotterdam, 9 November 2010

Harmonisation of private law in Europe, lecture Sungkyunkwan University Law School, Seoul, 28 October 2010

Harmonisation of Law: on Mixed Jurisdictions and the Importance of Comparative Inspiration, lecture Gwangju international conference celebrating the 30th anniversary of the CISG, Chonnam National University Law School, Gwangju , 26-27 October 2010

Contract Law in the European Union, lecture Chosun University Law School, Gwangju, 25 October 2010

Codification in Europe and China: What makes Contract Law special?, lecture conference Towards a Chinese Civil Code: Historical and Comparative Perspectives, City University of Hong Kong, 22-23 October 2010. Lecture available on

Codification of Private Law in China and Europe, lecture Law Institute of the Chinese Academy of Social Sciences, Beijing 19 October 2010

Private Law in a Post-National Society, lecture conference Rethinking Legal Thinking, University of Helsinki, 26-28 August 2010

Complexity of Transnational Sources, comment on the General Report, 18th Congress of the International Academy of Comparative Law, Washington D.C., 31 July 2010

The Right to Change Your Mind? Rethinking the Usefulness of Rights of Withdrawal in Consumer Contract Law, lecture 15th meeting of the International Academy of Commercial and Consumer Law, Toronto 22-24 July 2010

Is a Codification of European Private Law Conceivable?, lecture Kolloquium Die Instrumentalisierung des Privatrechts durch die Europäische Union, ZERP, Universität Bremen, 9 July 2010

Harmonising the EU Consumer Protection Directives, lecture ‘Capitals of Europe Summer Abroad’ programme, Pennsylvania State University Law School, Brussels 28 June 2010

Towards a European Ius Commune, lecture annual Eurojuris-Jurismus conference, Maastricht 25 June 2010

Over doel en methode van de rechtswetenschap, lezing Vrije Universiteit Amsterdam, 22 juni 2010

Over juridisch onderzoek aan universiteit en HBO, lezing Congres Juridisch onderzoek in het HBO, Saxion Hogeschool Deventer, 15 juni 2010

Welcome address, inaugural meeting of ETHYRN young researchers network, University of Edinburgh, 8-9 June 2010

Enhanced Consumer Protection: A Matter for Europe?, lecture Finnish Association of Consumer Law, Helsinki, 19 May 2010

Legal Tourism: Contract, Marriage and Citizenship beyond the State, lecture Oxford Institute of European and Comparative Law, Oxford University, 29 April 2010

Is Law a Parasite? Explaining Differences among Legal Traditions, lecture expert seminar Evolutionary Approaches to Comparative Law, Ghent University, 23-24 April 2010

Over Omstreden rechtswetenschap, lecture Delft University, 19 April 2010

Legal Tourism: Can Law be a Product?, lecture Jagiellonian University, Krakow 26 March 2010

Is Law a Product?, lecture VIII Nordic Graduate School on ‘Law and Theory’, Lammi 18-19 March 2010

On Purpose and Method of Legal Scholarship, lecture Seminar Legal Science: What is it Good For?, University of Helsinki 17 March 2010

Civil Codes and Constitutions Beyond the State: Law as a Product, inaugural lecture Tilburg University, 5 February 2010 [brief Dutch version available here]

The use of the comparative method in European private law, lecture Academy Colloquium Methodology of comparative legal research in theory and practice: an approach from the inside out, KNAW Amsterdam 20-21 January 2010

Harmonisation of private law in Europe: attractive or not?, lecture University of Trnva, 14 December 2009

European private law: brave new world or a feast of diversity?, lecture conference Euroscepticism and Multiculturalism, Utrecht University, 7 December 2009

The unbearable fragmentation of private law?, lecture seminar Harmonisation, Competition and Fragmentation: an Integrated Perspective on European Private Law, University of Helsinki, 3 December 2009

European private law: what is going on?, lecture University of Eastern Finland, Joensuu 1 December 2009

Multiple sources of transnational law: problem or solution?, lecture University of Eastern Finland, Joensuu 30 November 2009

Positive Obligations and private law, comment Workshop Positive Obligations in the Case Law of the European Court of Human Rights, XIVth Ius Commune Conference, Maastricht University, 26 November 2009

Four lectures on European private law, Koc University, Istanbul, 9-10 November 2009

Contractenrecht als meergelaagde rechtsorde: uitdagingen voor de komende tien jaar, lezing congres Tien jaar Contracteren, Universiteit Utrecht, 6 november 2009

The DCFR: how to (re)present European private law?, lecture seminar European private law and its Ingredients, Tilburg University, 4 November 2009

Rethinking the Architecture of European Private Law, lecture Max Planck Institut für ausländisches und internationales Privatrecht, Hamburg, 20 October 2009

Plurality of Sources in European Private Law, or: How to Live with Legal Diversity?, lecture conference The Foundations of European Private Law, EUI Florence 28-30 September 2009

The Multidimensionality of European Constitutions, comment conference The Many Constitutions of Europe, University of Helsinki, 12-14 May 2009

The Draft Common Frame of Reference: the Right Way Forward?, lecture conference Perspectives on European Private Law, University of Santiago de Compostela, 7-8 May 2009

Comparative Property Law and Harmonisation, lectures South-African Research Chair in Property Law (SARCPL), University of Stellenbosch, 30 March and 3 April 2009

A Transnational Approach to Law: the Last Frontier?, lecture VII Nordic Graduate School, Lammi 19-20 March 2009

Legal Education in a Transnational World: Challenges for the Future, lecture conference Past, Present and Future of Legal Education: Celebrating 30 Years of Legal Education in the University of Lapland, Rovaniemi 16 March 2009

The Common Frame of Reference and the Draft Consumer Rights Directive, lecture Dickinson School of Law, Pennsylvania State University (audiovisual), 3 March 2009

Consumentenrecht: steeds meer een Europese zaak?, lecture Symposium Ontwerp EU-richtlijn consumentenrechten, Universiteit van Amsterdam, 28 January 2009

Human Dignity and Uniform Law: An Unhappy Relationship, lecture seminar Fundamental Rights and Private Law: A Means of Harmonisation?, University of Helsinki, 12 January 2009

Democracy and (European) Private Law: a Functional Approach, lecture conference Globalisation and Private Law: The Way Forward, University of Stellenbosch, 18-20 December 2008

Unjust Enrichment in the Draft Czech Civil Code and the European Model, lecture XI Forum on the Draft Czech Civil Code, Charles University Prague, Prague, 22 November 2008

The European Harmonization Process: Lessons for the Global Level?, lecture Dickinson School of Law, Pennsylvania State University, State College, 29 October 2008

Research Group on the Economic Assessment of Contract Law Rules (Joint Network on European Private Law), round table Venice International University, Venice, 23 June 2008

Methodology of Comparative Law: The Way Forward, workshop Comparative law, Conference Towards a European Legal Methodology Tilburg University, 10 June 2008

The Draft-CFR, Methodological Nationalism and the Road Towards a Truly European Private Law, lecture Conference Fifty Years of European Contract Law – The Private Law Society and the Common Frame of Reference, SECOLA, Barcelona 6-7 June 2008

Convergence of private law, lecture Honours programme Maastricht Faculty of Law, 16 April 2008

Rechtswetenschap als een normatieve discipline, lecture Netherlands Institute for Human Rights (SIM), Utrecht University, 8 April 2008

After the Common Frame of Reference – What Future for European Private Law?, workshop European University Institute, Firenze, 29 February-1 March 2008

Legal Europe – Coherence and/or Fragmentation, round table Kick-off seminar Centre of Excellence Foundations of European Law and Polity, University of Helsinki, 1 February 2008

Research Group on the Economic Assessment of Contract Law Rules (Joint Network on European Private Law), round table University Pompeu Fabra, Barcelona, 17 December 2007

Private law beyond the Nation State: Private Parties in the Age of Globalisation, lecture Conference Law in a Globalised World, Stellenbosch Institute for Advanced Study (STIAS), University of Stellenbosch, 6-8 December 2007

General Clauses in European Contract Law, lecture European University Institute, Firenze, 26 November 2007

Legal Science as an Argumentative Discipline, lecture conference on Methods of Human Rights Research, Maastricht University, 23-24 November 2007

A European Law on Unjust Enrichment?, lecture conference European Private Law Beyond the CFR, Universitat de Lleida, 25-26 October 2007

Three Aspects of Dutch Law, International Association of Law Schools conference Learning from Each Other, Kenneth Wang School of Law, Soochow University, Suzhou 18-19 October 2007

Contract Law in the Netherlands and in China, lecture Jiao Tong University, Shanghai 17 October 2007

Applying Evolutionary Theory: the Case of European Private Law, lecture conference Law, The State, And Evolutionary Theory, University of Bremen and The German Law Journal Annual Conference, 5 October 2007

How to Teach Law in a Transnational Way: Some Problems, McGill round table on Legal Education 2007, McGill University, Montréal 27-28 September 2007

The Practical Importance of Harmonization of Commercial Contract Law, lecture at the fortieth annual session of UNCITRAL (conference Modern Law for Global Commerce), Vienna 9-12 July 2007

Mixed Legal Systems: Lessons to Learn, lecture at the Second World Congress of the World Society of Mixed Jurisdiction Jurists, University of Edinburgh 27-29 June 2007

Chinese and European Contract Law: Looking Beyond the Black Letter, lecture seminar Contract Law in China and Europe, Maastricht 18 June 2007

Wat is goed rechtswetenschappelijk onderzoek?, lezing Universiteit van Tilburg 21 mei 2007

Are the national contract laws in Europe converging?, lecture 4th European Jurists’ Forum, Vienna 3-5 May 2007

Less is More; or: What is a Common Law for Europe?, lecture University of Helsinki, 21 March 2007

Law Making in the European Union: Promoting an Optional Contract Code, lecture conference Law Making in a Global World, Louisiana Law Review Symposium, Baton Rouge 26-27 January 2007

Foundations of European Private Law and Comparative Law, course for PhD-researchers, University of Helsinki, 15-17 January and 20-21 March 2007

Conference The Bottom-Up Approach to Comparative Law, University of Leuven, 21 December 2006, moderator of discussion

Neues Burgerlijk Wetboek und deutsche Schuldrechtsmodernisierung, lecture conference Schuldrechtsmodernisierung und europäisches Vertragsrecht, Bayerische Julius-Maximilians-Universität Würzburg, 27-28 October 2006

Fundamental rights and contract law, lecture conference Fundamental Rights and Private Law in the European Union, Universität Bremen 15-16 September 2006

Mixed Legal Cultures and their Cultural and Societal Basis, lecture conference on Private Law and the Many Cultures of Europe, University of Helsinki, 27-29 August 2006

Economische baten en kosten van eenvormig bedrijfsrecht: een commentaar, lezing congres Eenvormig bedrijfsrecht: realiteit of utopie?, Erasmus Universiteit Rotterdam, 23 June 2006

European private law: a plea for a spontaneous order, lecture conference European Integration and Law, Maastricht 8 June 2006

Grondrechten en vermogensrecht, lecture Maastricht District Court, 13 April 2006

Commercieel contractenrecht: pleidooi voor een optionele code, lecture conference for Willem Grosheide, Universiteit Utrecht, 5 April 2006

Nordic legal thinking: looking from outside, lecture at conference Nordic Law and Legal Thinking in Comparative Perspective, Vaasa, 2-3 March 2006

Common Frame of Reference and Optional Code: really the best way forward in European Contract Law?, lecture University of Helsinki, 1 March 2006

The future of European contract law: the siren call of the ‘best’ rule, staff seminar lecture, Paul M. Hebert Law Center, LSU, Baton Rouge 7 February 2006

The future of European contract law, lecture Tulane University Law School, 6 February 2006

Common Frame of Reference and Optional Code: how to find the best rules for European contract law?, lecture Friedrich-Wilhelm Universität Bonn, 21 November 2005

Belangenafweging in het privaatrecht, lecture Studiedag Belangenafweging door de rechter, Leiden University, 28 October 2005

Private Law and Fundamental Rights: A Sceptical View, lecture Conference Constitutionalization of Private Law, Leiden University, 3 June 2005

Unjust Enrichment and Formation of Contract, lecture Conference Unjust Enrichment (Schrage Symposium), Amsterdam, 17-19 March 2005

Het Europese actieplan: nieuwe initiatieven op het terrein van het Europees privaatrecht, lezing Nederlands Genootschap van Bedrijfsjuristen, VNO-NCW Den Haag, 23 september 2004

The Need for a Uniform Contract Law in Europe: a Sketch of the Problem, lecture seminar Empirical Perspectives on European Private Law, Maastricht 4 June 2004

The Principles of European Contract Law and the Harmonisation of Private Law within Europe, conference Principles of European Contract Law Part Three, lecture Universitat de Lleida, 7-8 May 2004

De doorwerking van grondrechten in het vermogensrecht, lezing staf-seminar Maastricht 28 januari 2004

Constitutionalisering van het vermogensrecht, lezing Nederlandse Vereniging voor Rechtsvergelijking, Amsterdam 16 december 2003

Commentaar bij preadvies van J.B.M. Vranken, Springen met lemen voeten, Erasmus Universiteit Rotterdam 12 december 2003

The contribution of Scotland as a mixed jurisdiction to the development of European private law, lecture conference ‘Scotland and the Netherlands: Workshops on Private law and the Ius Commune’, Edinburgh, 19-20 June 2003

Introduction & Chair workshop Europeanisation of Law, Conference Epistemology and Methodology of Comparative Law, KU/VU Brussels & European Academy of Legal Theory, Brussels 24-26 October 2002

Darwin en het recht: het belang van de evolutieleer voor het (privaat)recht, lezing stad=f-seminar Maastricht 13 maart 2003

The Future of Contract Law in Europe: Coherence or Chaos?, lecture Rechtswissenschaftliche Fakultät Westfälische Wilhelms-Universität Münster (Centrum für Europäisches Privatrecht), 23 January 2003

Contractuele remedies, lezing Universiteit Utrecht, 10 oktober 2002

Directive 99/44 on consumer sale: implementation in selected member-states, lecture Seminar EU Consumer Law: Vehicle or Obstacle for a European Civil Code?, EIPA Antenna Luxembourg/European Commission, 1 October 2002

Lecture (Round Table presentation), conference European Contract Law, Academy of European Law (ERA), Trier 14-15 March 2002

Omzetting van de Richtlijn in het buitenland, lezing workshop Nieuw Kooprecht, KU Leuven 5 maart 2002

Tegen Europese beginselen van privaatrecht, lezing Amsterdams Juridisch Genootschap, Amsterdam 5 februari 2002

A Multi-Layered Contract Law for Europe, lecture SECOLA conference on the Communication from the Commission on European Contract Law, KU Leuven, 1 December 2001

The Future of European Contract Law: on Diversity and the Temptation of Elegance, lecture conference Towards a European Ius Commune in Legal Education and Research, Maastricht 25-26 October 2001

Kopstuk-college contractuele remedies, Universiteit Utrecht 11 oktober 2001

The Development of European Private Law, lecture University of Stellenbosch, 25 September 2001

European Contract Law, guest lecture in LLM course Comparative Law of Obligations, University of Stellenbosch, 19 September 2001

Towards a European Private Law by Survival of the Fittest Rule?, lecture University of Aberdeen, 1 May 2001

Fairness in Business Transactions, lecture Universiteit Göteborg, 21 March 2001

Onderzoeksprogramma Europees privaatrecht, lecture UNISA Pretoria, 7 March 2001

Onderzoeksprogramma Europees privaatrecht, lecture University of Stellenbosch, 7 March 2001

The Maastricht approach, lecture University of Torino (Gaius Programme), 29 January 2001

De waarde van de Principles of European Contract Law voor het Belgisch en Nederlands recht, lezing workshop Ius Commune congres V, Leuven 23 november 2000

A European Ius Commune on the Liability of the Good Samaritan: of Moral Monsters and Legal Principles, Institut für internationales Privatrecht und Rechtsvergleichung, lecture Universität Osnabrück, 16 November 2000

Europees privaatrecht en een Europees BW, lezing Erasmus Universiteit Rotterdam 7 november 2000

The Inner Relationship between Unjust Enrichment, Negotiorum Gestio and Implied Contract, lecture Bregstein Congress The Law of Unjust Enrichment and Contract in the Context of European Private Law, Amsterdam 19-20 October 2000

Civil Law, Common Law and the Duty to Rescue, lecture Universität Regensburg, 15 December 2000

How to Predict the Differences in Uniformity in a Future European Private law?, lecture, Hart Workshop Comparative Law in the 21st Century, London 4-6 July 2000

Two lectures at the Seminar The Community Law Impact on Civil Law, Lodz (Poland) 28-29 June 2000, MATRA/EIPA

On Legal Transplants, Remedies and European Private Law, lecture GAIUS programme, Maastricht 13 July 2001

Rechterlijk overgangsrecht: op zoek naar consistentie, lecture BW-dagen, Leiden University, 22 June 2000

How to Predict the Differences in Uniformity between Different Areas of a Future European Private Law? An Evolutionary Approach, lecture workshop The Economics of Harmonisation of Law, University of Corte (Corsica), 25-27 May 2000

Remedies bij teleurstellende overeenkomsten: naar een nieuwe regeling van onvoorziene omstandigheden, dwaling, gedeeltelijke ontbinding en beperkende werking van de redelijkheid en billijkheid?, lezing Juri Sacrum, Leiden 16 februari 2000

Een Europees privaatrecht als gemengd rechtsstelsel: mogelijkheden en grenzen, lezing Dispuut voor rechtsvergelijking en IPR, Amsterdam 21 december 1998

De Bataafse Staatsregeling en het Burgerlijk recht, lezing congres Tweehonderd jaar Bataafse Staatsregeling 1798, Utrecht-Nijmegen 10-11 december 1998

How to Mix Legal Systems in a Fruitful Way?, lecture seminar Towards a European Private Law by Competition of Legal Rules, Maastricht 19 November 1998

Recente ontwikkelingen in het privaatrecht, lezing alumnidag Universiteit Maastricht 17 oktober 1998

De blijvende betekenis van Eggens voor de moderne privaatrechtsbeoefening, lezing bij de aanbieding van de Eggens-bundel, Agnietenkapel Amsterdam 13 oktober 1998

‘Wrongful birth’, lezing Utrechtsch Juridisch Dispuut `Antonius Matthaeus', Utrecht 21 januari 1998

Fiduciaire eigendomsoverdracht in het Nederlandse recht en het Sogelease-arrest, lezing Universiteit Leuven, 14 januari 1998

Towards a Framework for Legal Rules in European Private Law, lecture 4th Benelux-Scandinavian Symposium on Legal Theory, University of Turku, August 1998

Naar een Europees privaatrecht door vrij verkeer van rechtsregels, lezing 2de Ius Commune-congres, Universiteit Leuven, 14 november 1997

Privaatrecht en postmodernisme, lezing congres van de Werkgroep Rechtsgeschiedenis 19de en 20ste eeuw, Universiteit Utrecht 20 juni 1997

Waarom Rechtstheorie?, lezing aio-netwerk Rechtstheorie, Amsterdam 28 mei 1997

Twee colleges, vak Methodologie van het privaatrecht, Universiteit van Amsterdam 27 maart en 3 april 1996