Professor Christophe Hillion

  • Professor of European Law

Telephone number: +31 (0)71 527 3596
Faculty / Department: Faculteit Rechtsgeleerdheid, Instituut voor Publiekrecht, Europees Recht
Office Address: Kamerlingh Onnes Gebouw
Steenschuur 25
2311 ES Leiden
Room number B 1.28
Personal Homepage:​show_en.php3?medewerker_id=861​ChristopheHillion

Present position

Professor of European Law, Law School, University of Leiden (2005-); Faculty of Law, University of Stockholm (2010-)  

Senior Researcher,
Swedish Institute of European Policy Studies: research on EU external relations, neighbourhood, enlargement, constitutional and administrative law (2009-);

Associated Scholar
, Centre for European Legal Studies, Cambridge (2002-);

European Law Adviser,
Centre for European Strategy “demosEuropa”, Warsaw (2006-)  

Consultant on EU external relations and constitutional law
, to e.g. UK Cabinet Office (2002-03), UK Foreign and Commonwealth Office (2007-), Swedish International Development Agency (2007-), Ukrainian Ministry of Foreign Affairs (2007-), authorities of Northern Cyprus (2008), Council of Europe (2008)

Other activities

Co-founder/member, Centre for the Law of EU External Relations, T.M.C. Asser Institute, The Hague (2008-)  

Co-founder/member of Wider Europe Network: Research network on EU relations with East-European Neighbours, Sussex European Institute, Aston University Birmingham, Leiden Europa Institute (2006-)  

Member of editorial board: Common Market Law Review (2007-), European Foreign Affairs Review (2002-), Cambridge Yearbook of European Legal Studies (2000-2002), Ukrainian Journal of European Legal Studies (2009-)  

Occasional reviewer of European Law manuscripts: Cambridge University Press, Oxford University Press (2000-)  

Occasional lecturer at various European universities (Bibó István - Budapest, Copenhagen, Cambridge, Donetsk, Durham, Ghent, Gothenburg, Leiden, Lódz, London, Moscow, Nottingham, Prague, Sussex, Tallinn, Warsaw), institutes (College of Europe – Bruges/Natolin; European University Institute - Florence) and for the EU external relations programmes of the European Law Academy (Trier).  


2005 PhD degree in Law, University of Leiden                        
1996 Master of Advanced European Studies, College of Europe (Bruges/Natolin)
1996 MA in EU Law, Faculty of Law, University of Rennes (France)
1994 Degree (‘Maîtrise’) in Public Law, University of Rennes  


Books, and contributions to books  


  1. The European Union and its East-European NeighboursA laboratory for the organisation of EU external relations (Oxford, Hart Publishing, forthcoming)  
  2. Mixed Agreements Revisited (edited with Panos Koutrakos) (Oxford, Hart Publishing 2010)  
  3. The evolving system of EU external relations as evidenced in the EU partnerships with Russia and Ukraine (PhD dissertation, Leiden 2005)  
  4. EU Enlargement: a legal approach (edited collection), (Oxford, Hart publishing, 2004)  
  5. The General Law of EC External Relations (edited with Alan Dashwood) (London, Sweet & Maxwell, 2000)              

  Contributions to books    

  1. ‘EU enlargement’ in P. Craig and G. de Búrca (eds), The Evolution of EU Law (Oxford, Oxford University Press, forthcoming)
  2.  ‘Mixity and coherence: The significance of the duty of cooperation’ in C Hillion and P Koutrakos (eds) Mixed Agreements Revisited (Oxford, Hart Publishing 2010) pp. 87-115
  3. ERTA, ECHR and Open Skies - Laying the grounds of the EU system of external relations’ in M. Poiares Maduro and L. Azoulai eds, The Past and Future of EU Law (Oxford, Hart Publishing 2010) pp. 224-233 
  4. ‘A look back at Open Skies’ in M. Bulterman, L. Hancher, A. McDonnell and A. Sevenster (eds), Views of European Law from the Mountain (Alphen aan den  Rijn, Kluwer Law International, 2009) pp. 257-265
  5. ‘Restraining External Competences of EU Member States under CFSP’ (with Ramses Wessel) in M. Cremona and B. de Witte (Eds.), EU Foreign Relations Law - Constitutional Fundamentals (Oxford, Hart Publishing, 2008) pp. 79-121
  6. Tous pour un, Un pour tous!  Coherence in the External relations of the European Union’ in M. Cremona (ed.), Developments in EU External Relations Law, Collected Courses of the Academy of European Law, (Oxford, Oxford University press, 2008) pp. 10-36
  7. ‘The EU’s Neighbourhood Policy towards Eastern Europe’ in A. Dashwood & M. Maresceau (eds), Law and Practice of EU External Relations – Salient Features of a Changing Landscape (Cambridge, Cambridge University Press, 2008) pp. 309-333 
  8. ‘Potential and limits of accession treaties to achieve EU constitutional reforms’ in S. Blockmans, S. Prechal & W. Douma (eds.), Reconciling 'deepening' and 'widening' of the European Union (The Hague, TMC Asser Press, 2008) pp. 157-165
  9. ‘The Russian Federation’, in S. Blockmans and A. Lazowski (eds), The European Union and its Neighbours, ‘The Hague, TMC Asser Press, 2006) pp. 436-499
  10. ‘Approximation and partnership’ (with Roman Petrov), in Y. Borko & O. Butorina (eds), Russia and the European Union (Moscow, Institute for Europe, Russian Academy of Science, 2006) pp. 316-330
  11. ‘Thou shalt love thy neighbour… The European Neighbourhood Policy Action Plan between the EU and Ukraine’, in A. Mayhew and N. Copsey (ed.), Just Good Friends? Ukraine, Belarus, Moldova and European Neighbourhood Policy (Brighton, Sussex European Institute, 2005) pp. 17-25
  12. ‘The Copenhagen criteria and their progeny’, in C. Hillion (ed), EU Enlargement: a legal approach (Oxford, Hart publishing, 2004) pp. 1-23  
  13. ‘New membership bids into the EU and their impact on trade with Australia and Asia’, in C. Saunders & G. Triggs (eds) Trade and Cooperation with the European Union in the next millennium (The Hague, Kluwer Law International, 2002) pp. 63-69 
  14. ‘Separation of powers between EU institutions’, in M. Cichocki (ed) Does the European Union need a Constitution? (Warsaw, Publications of the Centre for International Relations, 2002) pp. 29-35.
  15. ‘Approximation of laws in the context of EU-NIS partnership’ in L. Ficzere, A. Kellermann and A. Nikodem (eds.), Perspectives of the Legal Approximation Process in Central and Eastern Europe (Budapest, Academy of European Law - Bibó István College, 2001) pp. 78-86
  16. ‘Common strategies and the interface between EC external relations and CFSP’, in A. Dashwood & C. Hillion (eds.), The General Law of EC External Relations (London, Sweet & Maxwell, 2000) pp. 287-301
  17. ‘Introduction to the partnership and cooperation agreements’, in A. Kellermann, J. de Zwaan and J. Czuczai (eds.), EU enlargement – The Constitutional Impact at EU and National Level (The Hague, TMC Asser Press, 2001) pp. 215-229 
  18. ‘EU enlargement: a legal analysis’, in A. Arnull & D. Wincott (eds.), Legitimacy and Accountability in the European Union (Oxford, Oxford University Press, 2002) pp. 401-419    

  International (refereed) journals   
  1. ‘Competence distribution in EU external relations after ECOWAS: clarification or continued fuzziness?’ (with Ramses Wessel), 46 Common Market Law Review, 2009 (pp. 551-586)
  2. Annotation: Case C-265/03, Igor Simutenkov v. Ministerio de Educacion y Cultura, Real Federacion Espanola de Futbol, [2005] ECR I-2579; 45 Common Market Law Review, 2008 (pp. 815-833)
  3. ‘Mapping-out the new contractual relations between the European Union and its neighbours – Learning from the EU-Ukraine enhanced agreement’ 12 European Foreign Affairs Review, 2007 (pp. 169-182) 
  4. ‘Negotiating Turkey’s Membership to the European Union – Can Member States do as They Please?’ 3 European Constitutional Law Review, 2007 (pp. 269-284) 
  5. ‘The European Union is dead. Long live the European Union… A Commentary on the Accession Treaty 2003’, 29 European Law Review, 2004 (pp. 583-612)
  6. ‘Enlargement of the European Union: The discrepancy between Accession conditionality and membership obligations’, 27 Fordham International Law Journal, 2004 (pp. 715-740)
  7. ‘Tobacco products in the internal market’, 63 Cambridge Law Review, 2004 (pp. 297-300) 
  8. ‘Draft Constitutional Treaty of the European Union and related documents’ (With A. Dashwood, M. Dougan, A. Johnston and E. Spaventa), 28 European Law Review, 2003 (pp. 3-38) 
  9. Annotation of Cases C-63/99 Gloszczuk; C-235/99 Kondova; C-257/99 Barkoci and Malik; Case C-268/99 Jany e.a, Case C-162/00 Poprzeptowicz-Meyer, 40 Common Market Law Review, 2003 (pp. 465-491) 
  10. Annotation of Case C-62/98 Commission of the European Communities v Portugal, and Case C-84/98 Commission of the European Communities v Portugal, 38 Common Market Law Review, 2001 (pp. 1269-1283) 
  11. ‘Institutional Aspects of the partnership between the EU and the newly independent states of the former Soviet Union’, Georgian Law Review, 2001 (pp. 3-19) 
  12. ‘Advertising Tobacco: “if you must, you may”’, 60 Cambridge Law Journal, 2001 (pp. 486-489) 
  13. ‘Institutional aspects of the partnership between the EU and the newly independent states of the former Soviet Union – case studies of Russia and Ukraine’, 37 Common Market Law Review, 2000 (pp. 1211-1235) 
  14. ‘Partnership and cooperation agreements between the EU and the Newly Independent States of the ex-Soviet Union’, 3 European Foreign Affairs Review, 1998 (pp. 399-415) 
  15. ‘EU shapes for Eastern Enlargement’, 10 EU Focus, 1998 (pp. 2-5) 
  16. ‘Trade dispute overshadows entry into force of the EC-Ukraine agreement’, 6 EU Focus, 1998 (pp. 9-12)    

  Electronic publications   

  1. ‘Le Service Européen pour l’Action Extérieure: vers une diplomatie commune?’ Robert Schuman Foundation Policy Paper no 169, May 2010 (pp. 1-8)
  2. ‘Mixity and coherence: The significance of the duty of cooperation’, CLEER Working Papers 2/2009 (pp 1-35)
  3. ‘The Eastern Partnership - something new or window-dressing?’ (with Alan Mayhew) Sussex European Institute Working Paper No. 109, January 2009 (pp. 1-24)
  4. ‘The Framework Convention for the Protection of National Minorities and the European Union, report to the Council of Europe’ (2008)  (pp. 1-18)
  5. ‘A new framework for the relations between the Union and its East-European neighbours’ European University Institute Law Working Paper (2007) (pp. 1-10)
  6. L’Union fait la force? Potential and limits of the European Neighbourhood Policy as an integrated EU foreign and security policy’ (with Marise Cremona), European University Institute Law Working Paper No 39/2006
  7. (pp. 1-26) 
  8. The new relationship between the European Union and its ENP partners – lessons for the future EU-Ukraine agreement’; DemosEuropa Papers 2006 (pp. 1-9)    

Last Modified: 21-12-2015