Matthieu practices international arbitration, commercial dispute resolution and public international law. Prior to joining the Bar, Matthieu qualified as a New York attorney in 2011 and worked as an associate in the international arbitration team of Cleary Gottlieb, Steen & Hamilton, in Paris and as a consultant for the World Bank.

Matthieu was appointed to the Attorney General’s Public International Law C Panel of Counsel in 2017.

Current and recent representative experience includes:

  • Acting as junior counsel for the intervening parties in R (Miller & others) v Secretary of State for Exiting the European Union [2016] EWHC 2768, and before the Supreme Court in R(Miller & others) v Secretary of State for Exiting the European Union [2017] UKSC 5 (led by Patrick Green QC and Henry Warwick);
  • Acting as sole counsel in two LCIA arbitrations arising out of sale of goods contracts for ethyl and fuel alcohol (details not public);
  • Acting as junior counsel for the First Claimant in the enforcement proceedings arising out of the Award in Micula & Others v Romania: [2017] EWHC 31 (Comm) (led by Sir Alan Dashwood QC and Patrick Green QC);
  • Acting for the claimants in City-State N.V. et al. v Ukraine, ICSID Case No. ARB/14/9, a dispute under a bilateral investment treaty in relation to various breaches of the treaty (led by Stephen Fietta);
  • Acting as sole counsel for a Ukrainian company in a commercial arbitration pursuant to the ICC Rules in relation to a dispute under a contract in the telecommunications sector (details not public);
  • Acting as junior counsel for the Claimant in arbitration commenced under the ECT and governed by the SCC rules in the energy sector in relation to breaches by an Eastern European State of the ECT (details not public);
  • Acting as junior counsel for the Claimant in an arbitration commenced pursuant to a bilateral investment treaty and the SCC rules in the banking sector in relation to breaches by an Eastern European State of the BIT (details not public, led by Matthew Weiniger QC and Stephen Fietta);
  • Advising a party in potential challenge proceedings following a bilateral investment treaty arbitration award (details not public, with Stephen Fietta);
  • Acting as junior counsel for the Respondent in Tethyan Copper Company Pty Limited v Islamic Republic of Pakistan, ICSID Case No. ARB/12/1, and  Tethyan Copper Company Pty Limited v Province of Balochistan, ICC Case No. 18347/VRO/AGF, arbitrations arising out of the refusal of a mining licence over copper and gold deposits at Reko Diq, in Pakistan (led by Graham Dunning QC and Cherie Blair QC);
  • Advising a multinational company on enforcement proceedings in various jurisdictions following a successful £8 million ad hoc award (confidential);
  • Advising an international organization on drafting an arbitration agreement with a series of contractors for waste management (confidential);
  • Acting as junior counsel for a Defendant in Chevron Corporation v Amazonia Recovery Limited & others (Supreme Court, Gibraltar), complex proceedings concerning alleged commercial conspiracy arising from US$18 billion judgment in respect of environmental pollution in Ecuador with associated arbitration proceedings (the Chevron v Ecuador BIT proceedings) and proceedings in New York and elsewhere (led by Vernon Flynn QC (Essex Court Chambers), Patrick Green QC (Henderson Chambers) and Jonathan Adkin QC (Serle Court) and Henry Warwick);
  • Acting as junior counsel in a 6-week trial brought by the HSE against an aerospace company raising significant issues in relation to parent company liability (R v CAV) (led by Prashant Popat QC);
  • Appearing as sole counsel in numerous civil matters (including, but not limited to, commercial, product liability, consumer credit, property and landlord/tenant disputes) before County Courts and the High Court.

Areas of Expertise

International Arbitration
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Matthieu practices investment treaty arbitration and international commercial arbitration, often in proceedings with an English law element (whether as the governing law of the contract or the proceedings), either led or as sole counsel.  Matthieu also appears in arbitration-related proceedings. Current and recent experience includes:

  • Acting for the Claimant in Viorel Micula v Romania, High Court, Claim 2014-1197, in proceedings relating to enforcement of an ICSID Award.
  • Acting for the Claimant in arbitration commenced under the ECT and governed by the SCC rules in the energy sector in relation to breaches by an Eastern European State of the ECT (details not public).
  • Acting as sole counsel in two LCIA arbitrations arising out of sale of goods contracts for ethyl and fuel alcohol (details not public).
  • Acting for the claimants in City-State N.V. et al. v Ukraine, ICSID Case No. ARB/14/9, a dispute under a bilateral investment treaty in relation to various breaches of the treaty.
  • Acting for the Claimant in an arbitration commenced pursuant to a bilateral investment treaty and the SCC rules in the banking sector in relation to breaches by an Eastern European State of the BIT (details not public).
  • Acting as sole counsel in a two-week hearing for a Ukrainian company in a commercial arbitration pursuant to the ICC Rules in relation to a dispute under a contract in the telecommunications sector (details not public).
  • Advising a party in potential challenge proceedings following a bilateral investment treaty arbitration award (details not public).
  • Acting for the Respondent in Tethyan Copper Company Pty Limited v Islamic Republic of Pakistan, ICSID Case No. ARB/12/1, a dispute under a bilateral investment treaty, in relation to the refusal of a mining licence over very large-scale copper and gold deposits at Reko Diq, in Pakistan (led by Cherie Blair QC and Graham Dunning QC).
  • Advising a multinational company on enforcement proceedings in various jurisdictions following a successful £8 million ad hoc award (confidential)

Prior to joining the Bar, Matt has:

  • Advised and acted for OJSC Tatneft in claim brought under the Russia-Ukraine BIT arising out of a raider takeover of Ukraine’s largest refinery, in which OJSC Tatneft was a shareholder (as an attorney ; applicable rules: UNCITRAL);
  • Advised a major German company on investment protections available under the Libya-Germany BIT following the destruction of its property in Libya (as an attorney; applicable rules: ICSID);
  • Advised and acted for a major multinational steel company on an €11 million construction dispute arising out of the construction of a steel factory in the Czech Republic (as an attorney, applicable rules: ICC);
  • Advised and acted for a major French oil refining company in €40 million dispute arising out of the closing down of an oil refinery in the South of France (as an attorney, applicable rules: ICC);
  • Advised and acted for a major Dutch company in relation to a dredging dispute in Nigeria (as an attorney, applicable rules: LCIA);
  • Acted as secretary to a three-member tribunal (at an attorney, applicable rules: ICC).

As a consultant for the World Bank, Matthieu has advised the States and Chambers of Commerce on the creation of arbitration and/or mediation laws or centres and the reform of investment laws-

  • Bangladesh: advised the Bangladeshi government on reforming the Bangladesh Arbitration Act 2001. Assisted in developing a sustainability plan for the Bangladesh International Arbitration Centre (BIAC);
  • Turkey: reviewed and advised on the creation of the government-led Istanbul Arbitration Centre;
  • Liberia: reviewed and revised the Commercial Court Rules relating to alternative dispute resolution;
  • Vietnam: assisted in the drafting of the rules of the Financial and Commercial Court of Arbitration, aimed at developing arbitration in the banking sector in Vietnam. Assisted in creating the
    interpretative guidance on the Law of Commercial Arbitration, issued by the Vietnamese government to avoid undue court interference in the arbitral process;

Matthieu also publishes widely in this area, most recently in the November edition of the Journal of International Banking and Finance Law.

Matthieu combines his practice with the role of adjunct professor of law (international commercial arbitration) at Pepperdine Law School, University of Malibu (London Campus).

Commercial
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Matthieu represents clients in commercial disputes including those concerning business investments, the sale and supply of goods and services, complex civil fraud with a particular emphasis in claims raising issues of conflicts of laws or international enforcement.  Matthieu has experience of county courts, the High Court, foreign jurisdictions and international tribunals.

Matthieu also has experience in finance and consumer credit, having represented a major multinational financial services corporation in actions brought against it under the Consumer Credit Act 1974, and provided advice on the application of the Consumer Credit Act 1974 and corporate restricting.

Current and recent work includes:

  • Acting as a junior for a Part 20 Defendant in a £40 million aviation claim.  Led by Prashant Popat QC (Henderson Chambers)
  • Acting for the defendant in Chevron Corporation v Amazonia Recovery Limited & others (Supreme Court, Gibraltar), complex proceedings concerning alleged commercial conspiracy arising from US$18 billion judgment in respect of environmental pollution in Ecuador with associated proceedings in New York and elsewhere. Led by Vernon Flynn QC (Essex Court Chambers), Patrick Green QC (Henderson Chambers) and Jonathan Adkin QC (Serle Court).
  • Appearing on behalf of a major multinational financial services corporation in a breach of contract claim.
  • Advising a middle-eastern company on damages in a multi-million pound distribution contract.
  • Advising lenders in relation to a range of aspects of financial services regulation.
Public International Law
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Matthieu practices international investment treaty arbitration and international public law, with a particular interest in international economic law. He acts for claimants and respondents in cases under a variety of rules, in particular ICSID, SCC, UNCITRAL, as well as in arbitration-related court proceedings.

Matthieu was appointed to the Attorney General’s Public International Law C Panel of Counsel in 2017. He also maintains a keen interest in WTO and international trade law, having recently presented a paper at the Annual Conference on WTO Law in Geneva titled “The Legal Consequences of Brexit on Investment Protection: Disentangling a Complex Web and Spinning a New One” and published an article on “Remedies in investment treaty arbitration and WTO law: complementary systems?” in the Journal of International Banking and Financial Law.

Current and recent work includes:

  • Acting for the Claimant in arbitration commenced under the ECT and governed by the SCC rules in the energy sector in relation to breaches by an Eastern European State of the ECT (details not public).
  • Acting as junior counsel for the intervening parties in R (Miller & others) v Secretary of State for Exiting the European Union [2016] EWHC 2768, and before the Supreme Court in R(Miller & others) v Secretary of State for Exiting the European Union [2017] UKSC 5 (led by Patrick Green QC and Henry Warwick), which gave rise to numerous issues of treaty interpretation and acquired rights.
  • Acting for the claimants in City-State N.V. et al. v Ukraine, ICSID Case No. ARB/14/9, a dispute under a bilateral investment treaty in relation to various breaches of the treaty.
  • Acting for the Claimant in an arbitration commenced pursuant to a bilateral investment treaty and the SCC rules in the banking sector in relation to breaches by an Eastern European State of the BIT (details not public).
  • Advising a party in potential challenge proceedings following a bilateral investment treaty arbitration award (details not public).
  • Acting for the Claimant in Viorel Micula v Romania, High Court, Claim 2014-1197, in proceedings relating to enforcement of an ICSID Award.
  • Acting for the Respondent in Tethyan Copper Company Pty Limited v Islamic Republic of Pakistan, ICSID Case No. ARB/12/1, a dispute under a bilateral investment treaty, in relation to the refusal of a mining licence over very large-scale copper and gold deposits at Reko Diq, in Pakistan (led by Cherie Blair QC and Graham Dunning QC).
  • Advising an international organization on drafting an arbitration agreement with a series of contractors for waste management (confidential)
  • Advising an investor on a potential claim under a BIT against a CIS State (confidential)
  • Advising and acting for OJSC Tatneft in claim brought under the Russia-Ukraine BIT arising out of a raider takeover of Ukraine’s largest refinery, in which OJSC Tatneft was a shareholder (as an attorney ; applicable rules: UNCITRAL);
  • Advising a major German company on investment protections available under the Libya-Germany BIT following the destruction of its property in Libya (as an attorney; applicable rules: ICSID);
  • Prepared pleadings for admitting third-party claims to the Extraordinary Chambers of the Courts of Cambodia (pro bono)
Product Liability
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Matthieu has experience of a wide range of group litigation and product liability claims.  In particular, he has assisted counsel in the provision of advice and pleadings in matters involving causes of action under the Consumer Protection Act 1987 and European Council Directive No.85/374/EEC, and the Sale of Goods Act 1979.  He has also acted as a junior for a Part 20 Defendant in a £40 million product liability claim, led by Prashant Popat QC (Henderson Chambers).

European Law
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Matthieu is developing experience in European Union law, with a particular focus on matters relating to international arbitration and Brexit. Current and recent work includes:

  • Acting for the Claimant in Viorel Micula v Romania, High Court, Claim 2014-1197, in proceedings relating to enforcement of an ICSID Award (led by Sir Alan Dashwood Qc and Patrick Green QC).
  • Acting for the intervening parties in R (Miller & others) v Secretary of State for Exiting the European Union [2016] EWHC 2768, currently before the Supreme Court.
  • Acting for the applicant in Fair Deal for Expats & others v Commission of the European Union (Case T-713/16): challenge in the General Court of the European Union under Article 263 TFEU in respect of measures preventing negotiations between representatives of the United Kingdom and the Commission pending notice under Article 50 TEU.

Qualifications & Memberships

BA in Law, University of Cambridge; Masters in International Political Economics (Sciences Po, Paris); LLM (Georgetown University, D.C.); BPTC

English, French (fluent), Spanish (intermediary).

VAT registration number: 195908752