Jacquelyn MacLennan | White & Case LLP International Law Firm, Global Law Practice
Jacquelyn MacLennan
Jacquelyn MacLennan

Jacquelyn MacLennan

Partner, Brussels, London

“A superb practitioner and very good public speaker who always looks for solutions.”

Chambers Europe 2015


Jacquelyn MacLennan offers a wealth of experience for clients worldwide, representing leading multinational corporations, governments and trade associations.

She focuses on EU competition law, and clients benefit from her experience and insight in developing strategy and running major international cartel investigations, as well as advising on complex distribution problems and licensing arrangements, abuse of dominance cases, mergers and joint ventures.

She also advises on EU customs and trade law, as well as EU regulatory requirements, notably in respect to product safety and environmental regulation.

With an impressive track record of experience and know-how, Jacquelyn litigates regularly before the EU and UK courts, and represents clients before the European Commission.

Jacquelyn has accumulated substantial management experience over her career; she is currently a member of the Partnership Committee (the main governance body) of White & Case, and a former Member of the Executive Committee (responsible for the firm's strategy) and Executive Partner heading the Brussels office. In October 2015, she became the Global Pro Bono Practice Leader.

Clients describe Jacquelyn as "excellent – an industry leader in antitrust matters" and "commercially-minded and solution-oriented." (Chambers Europe, 2016)

Bars and Courts

  • Solicitor in Scotland
  • Notary Public
  • Brussels Bar (E list)


  • Diploma in Legal Practice, University of Edinburgh
  • LLB (Hons), University of Edinburgh


  • English
  • French


Toshiba—global proceedings—appeal to Court of Justice of the EU and current appeal to General Court

Jacquelyn is representing Toshiba Corporation in multijurisdictional proceedings concerning Gas Insulated Switchgear. This involved a successful appeal of the original European Commission decision fining Toshiba €90.9 million for participating in a global cartel to the European General Court—where the Court annulled in full the fine on Toshiba—and a further appeal to the Court of Justice of the EU. An appeal to the General Court is now pending of the new, lower, fine imposed by the Commission.

Major multinational—customs issue

Jacquelyn represented a major multinational in successful proceedings involving the World Customs Organization, European Commission, national customs authorities and national courts concerning the classification of insulated-gate bipolar transistors.

Toshiba—preliminary ruling to Court of Justice of the EU

Jacquelyn represented Toshiba in a seminal preliminary ruling to the European Court of Justice, which established the principles governing the scope for parallel proceedings by national competition authorities and the European Commission.

US chemicals multinational—customs matters

Jacquelyn advises a US chemicals multinational on a range of high-level customs matters, including rules of origin, tariff quotas and special customs procedures (such as temporary importation).

Toshiba—appeal to European General Court

Jacquelyn is representing Toshiba in an appeal to the European General Court of the Commission Decision in Cathode Ray Tubes (CRT) used for TVs and computer monitors, regarding fundamental principles of EU jurisdiction in competition law.

Multinational corporations—environmental issues etc.

Jacquelyn is advising major multinational corporations on environmental issues at EU and at national level, as well as handling compliance issues, including inspections by competent authorities, and product recalls.

Toshiba—appeal to Court of Justice of the EU

Jacquelyn is representing Toshiba in an appeal to the Court of Justice of the EU against a Commission Decision finding a home market protection agreement in Power Transformers.

Speaking Engagements

"Handling investigations and managing risk in a global business environment", 6-8 May 2015: Spring Symposium for Taiwan Technology Companies,

Seminar on "The Precautionary Principle in EU Law", 13 October 2014: Edinburgh University

"Capturing Global Competitive Advantage", 7–9 October 2014: Moderator of a high-level panel in the White & Case Seminar Series,

"Fines, Leniency, Settlements and Private Damages", March, April, June 2014: Presentations on Cartel Defense Strategy for the W&C Competition Seminar Series,

Seminar and panel speaker at the IFLR Women in Business Law Conference, "Building the Talent Pipeline", 18 June 2014: London

"Women in the law: advancing female legal staff – achievements and challenges", 29 October 2013: Conference Board,

"Joint Ventures and Horizontal Agreements", 10 October 2013: IBC's Competition Law Compliance conference,

"Pricing and rebates update", 19 March 2013: Informa: Dominancy & Pricing 2013,

"EU Competition Policy: European Public Policy", 15 March 2013: Edinburgh University Academy of Government,


  • Competition Law in China – an ant on the move?, The Lawyer, May 2012
  • EC Competition Law Developments, Oxford Yearbook of European Law, 1997–1998, 1999–2000, 2001–2002, 2003–2004, 2005–2006, 2007–2009, 2010, (co-author)
  • Recent Developments in EU Competition Law, The Lawyers, November 2008, (published in Japanese) (co-author, with Alexandra Rogers)
  • Series of five articles on EU Corporate Governance Developments, Journal of the Japanese Institute of International Business Law, Vol. 32 No. 9–10/2004 and Vol. 33, No. 11–12/2005
  • Cracking the Customs Code: How to Export to Europe Effectively, ACC Docket, June 2006, (co-author, with Louis Apker and Steven Lyverse)

Awards & Recognition

Best in Competition & Antitrust, Euromoney Women in Business Awards – Europe, 2016

Leading Lawyer: Competition/European Law — Belgium, Chambers Europe 2016

Leading Lawyer: Environment: EU Regulatory — Belgium, Chambers Europe 2016

Leading Lawyer: International Trade/WTO — Europe-wide, Chambers Europe 2015

Leading Lawyer: International Trade/WTO — Belgium, Chambers Europe 2015

Recommended: Competition: EU and global – Belgium, Legal 500 EMEA 2016

Honorary Fellow, European Institute, University of Edinburgh

Best Business Anticompetitive Practices Article, 2012 Antitrust Writing Awards

Institute of Competition Law

Member of Chatham House

Member of the Environmental Law Network International (elni)