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Leon Ioannou

Counsel

Paris

+33 (0) 1 44 05 80 35

leon.ioannou@hugheshubbard.com
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“Leon Ioannou”

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Leon Ioannou is a common law-trained lawyer in Hughes Hubbard & Reed's Paris office. Leon's practice focuses on international commercial and investment treaty arbitration, particularly in the construction, energy (nuclear, oil and gas), utilities, telecommunications, pharmaceutical, banking and finance, and corporate and legal services industries. He has conducted proceedings under most of the major arbitral institutional rules as well as ad hoc proceedings under the United Nations Commission on International Trade Law (UNCITRAL) Rules. He has worked on disputes governed by common law and by civil law.

Leon is ranked in the Who's Who Legal: Arbitration – Future Leaders 2017, 2018, 2019, 2020 and 2021 guides as one of the world's leading arbitration experts under 45.  He speaks and lectures regularly on theoretical and practical aspects of international arbitration. 

Leon also has experience conducting international corporate internal investigations, particularly in relation to the U.S. Foreign Corrupt Practices Act (FCPA), and providing advice on general corporate matters.  Previously, Leon worked as an in-house financial analyst at some of Australia’s largest companies.

Highlighted Publications

  • “What’s French for backflip? French decision overturned to align with legislation and earlier jurisprudence on enforcement” (September 2018) IBA Arbitration Newsletter
  • "Coming Up From Down Under: A Look at Australia’s Changing Anti-Bribery Framework" (26 June 2018) 26 International Review of Compliance and Business Ethics 33
  • "How Far Do Your Arms Reach? A Brief Case Study on the Extraterritoriality of Anti-Bribery Laws" (29 March 2018) 13 International Review of Compliance and Business Ethics 38
  • "France returns to its past position on enforcement against diplomatic assets" (2017) 22(1) Arbitration News (International Bar Association Legal Practice Division) 51
  • "What’s French for backflip? French decision overturned to align with legislation and earlier jurisprudence on enforcement" (September 2017) IBA Arbitration Newsletter
  • "Recent decision confirms France's readiness to enforce international arbitral awards annulled at place of arbitration" (2006) Bulletin n°17 de l’International Bar Association Legal Practice Division Arbitration Committee
  • "Separability Saved: U.S. Supreme Court Eliminates Threat to International Arbitration" (2006) 21(3) Mealey's International Arbitration Report 25
  • "Loosening up, but not too much: enforcement against diplomatic assets in France" (2016) 21(1) Arbitration News (International Bar Association Legal Practice Division) 53

Professional Activities

  • Member, ICC Australia Arbitrator Nominations Committee
  • Member of the Global Advisory Board, Young & International division of the International Centre for Dispute Resolution

Highlighted Matters

  • Five UNCITRAL arbitrations in The Hague governed by public international law and with over US$ 1 billion at stake arising out of the Russian Federation’s annexation of Crimea in 2014
  • Multi-billion dollar ICC arbitration in Sweden governed by English law over the construction of a nuclear power plant
  • Multi-billion Euro ICC arbitration in France governed by French law over the construction of an oil refinery
  • Three ICSID arbitrations with over US$ 1 billion at stake against Argentina governed by public international law over investments in the utilities sector
  • Two US$ 500 million UNCITRAL arbitrations in Brussels governed by English law over contracts in the oil and gas sector, including multi-jurisdictional litigation relating to interim relief and actions against third parties
  • € 500 million ICC arbitration in Switzerland governed by Swiss law over a contract for the sale and purchase of an international pharmaceutical company
  • € 220 million UNCITRAL arbitration in London governed by English law over the commissioning of a power plant in Eastern Europe and the eventual termination of the EPC Contract
  • € 150 million UNCITRAL arbitration in Geneva governed by public international law over a public infrastructure investment in and against an Asian country
  • US$ 130 million ICC arbitration in Mexico City governed by Mexican law concerning the construction of underwater oil pipelines in the Gulf of Mexico
  • € 50 million ICSID arbitration against Serbia governed by public international law over investments in the agricultural and fertiliser industry
  • LCIA arbitration in London governed by English law over a payment dispute in connection with a deep sea gas development project in the South China Sea
  • ICC arbitration in Vienna governed by English law over the construction of an arena in Eastern Europe
  • ICC arbitration in Paris governed by French law over payment disputes under multiple sales consultancy agreements
  • Ad hoc arbitration in Greece governed by Greek law in connection with the construction of a motorway
  • UNCITRAL arbitration in London governed by English law over a payment dispute under a legal services agreement
  • Arbitration in Budapest under the arbitration rules of the Hungarian Chamber of Commerce over recovery of a bank loan following bankruptcy
  • ICC arbitration governed by an Asian law over a public infrastructure construction in Far East Asia
  • UNCITRAL arbitration in Brussels governed by general principles of law over a payment dispute under a legal services agreement
  • ICC arbitration in Switzerland governed by Swiss law over the termination of sale-and-purchase agreements
  • Pre-ICC arbitration representation of an energy company concerning the development of oil and gas fields offshore Africa
  • Pre-ICC arbitration representation of an energy company concerning a dispute over the construction of a gas facility in Central Asia
  • Pre-arbitration representation of a construction company concerning a dispute over the construction of a power plant in South America
  • Pre-ICC arbitration representation of an office services company concerning a dispute over a share purchase agreement
  • Secretary to tribunal in ICC arbitration in Paris governed by English law and the Vienna Convention for the International Sale of Goods over a price dispute for the sale of fuel

News

Litigation Wrap: Fourth Quarter 2019
News & Events |
Awards |
Deals & Matters
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Major Victory in Crimea Arbitrations Upheld
News & Events |
Deals & Matters
View News Article
Firm Shortlisted as Finalist for 2019 American Lawyer Industry Awards
News & Events |
Awards
View News Article
Hughes Hubbard Wins Two More Crimea Awards Against Russia
News & Events |
Deals & Matters
View News Article
​Firm Helps Advance Crimea Arbitrations Against Russia
News & Events |
Deals & Matters
View News Article
Hughes Hubbard Promotes Four to Partnership and Ten to Counsel
News & Events
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Firm Wins Major Victory in Crimea Arbitrations
News & Events |
Deals & Matters
View News Article
​Firm Wins Last Two Jurisdiction Decisions in Crimea Arbitrations
News & Events |
Deals & Matters
View News Article
In GAR: Crimea Real Estate Claim Goes Forward
Articles & Press
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Hughes Hubbard Wins Jurisdiction Decisions in Crimea Arbitration
News & Events
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Permanent Court of Arbitration Announces Update in Cases Involving Hughes Hubbard
Articles & Press
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Ukrainians Hit Russia with Multimillion-Dollar Claims
Articles & Press
View News Article
Education
  • University of New South Wales, Australia, LL.B., 2003, Executive Editor, University of New South Wales Law Journal, 2003, Editorial Board Member, University of New South Wales Law Journal, 2002-2003
  • University of New South Wales, Australia, Bcomm, 2000, Co-op Program Scholar, 1997-2000
Bar Admissions
  • England & Wales
  • France (Paris)
  • Ireland
  • New South Wales, Australia
Languages
  • English
  • French
Areas of Focus
Arbitration
Construction Litigation & Arbitration
Investment Treaty Arbitration
Litigation
Also of Interest:
  • Rhidian David
  • Olivier Dorgans
  • Agnès Braka-Calas

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