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Gregg is a dispute resolution partner in our London office.

Gregg specialises in complex commercial disputes, including class actions, across a range of sectors, particularly the energy and aviation sectors.

Based in London, he has previously practised from our Melbourne and Tokyo offices. He has extensive experience of heavyweight litigation, usually with a cross-border element, as well as international arbitration, regulatory investigations and litigation, and public inquiries. 

Gregg has a particular focus on class action litigation and he has conducted a range of class actions in England and Australia. He is a co-editor and author of the leading English practitioner text on class actions, Class Actions in England and Wales, the second edition of which was published in September 2022 by Sweet & Maxwell, and a contributing author to the 3rd edition of Class Actions in Australia, published by Thomson Reuters in 2021.

Gregg is an accredited mediator with the Centre for Effective Dispute Resolution.


Gregg was educated at King's College London (LLB), Keble College, Oxford (BCL, MPhil) and Panthéon-Sorbonne, Paris (LLM). Prior to joining the firm, he practised at the bar in England for several years. He became a partner in the firm’s London office in 2014. He was seconded to the firm's Melbourne office from 2019-2021 and the Tokyo office from 2009-2010. Gregg is admitted in England & Wales and Australia. He is fluent in French.

Experience & expertise

Selected matters

  • the State of Victoria (Australia) in multiple class actions in the Supreme Court of Victoria relating to the conduct of the COVID-19 hotel quarantine programme
  • Iveco and Fiat Chrysler in proceedings in the English High Court and the Competition Appeal Tribunal relation to follow-on damages claims stemming from the European Commission’s settlement decision in Trucks
  • PricewaterhouseCoopers, Vocus and Murray Goulburn in defending multiple funded shareholder class actions in the Federal Court of Australia
  • Société Générale in relation to a $1.5 billion claim in the English Commercial Court by the Libyan Investment Authority in relation to a series of trades where there were allegations of bribery and intimidation
  • BP, ENI, Repsol Sinopec and JX Nippon in English Commercial Court proceedings under various gas sales agreements arising out of the prolonged shut-in of a North Sea field
  • the shareholders of Optal in an expedited claim in the English Commercial Court relating to sale of the company where the buyer sought to rely on the SARS-Cov-2 pandemic as a Material Adverse Effect
  • Various aircraft lessors in relation to the termination of lease agreements, the repossession of aircraft and multi-jurisdictional litigation including in the English Commercial Court.