Gareth Keillor


DDI +44 (0) 20 4526 9305
M +44 (0) 7716 642447

Gareth has experience in a wide range of commercial disputes of varying size and complexity, including High Court litigation and offshore jurisdictions (including BVI, Cayman Islands, Isle of Man, Guernsey, Jersey and Bermuda), as well as arbitrations.

He has acted for a wide variety of international clients, from major companies to ultra-high net worth individuals and has a particular interest in fraud cases, commercial contract disputes, shareholder disputes and disputes involving injunctive relief.

Gareth has considerable experience in disputes arising out of the Commonwealth of Independent States (CIS).

Gareth is also experienced in trust disputes, both acting for beneficiaries and for trustees, and disputes involving allegations of breach of fiduciary duty. Gareth is a full member of the Society of Trusts and Estates Practitioners (STEP).

  • – Acting for a multinational energy company in a dispute arising out of a Bulgarian joint venture.
  • – Acting for a major property developer in a dispute in the High Court, and subsequent litigation in New York and the BVI (including successfully resisting fraudulent attempts to wind-up corporate vehicles), in relation to control of a luxury hotels business. The matter was one of The Lawyer’s Top 20 Cases for 2015.
  • – Advising a large corporate in a dispute with its rating agency concerning a ratings downgrade.
  • – Acting for PacifiCorp in its claim against HMRC for the recovery of unlawfully levied SDRT (part of the Stamp Taxes Group Litigation Order).
  • – Advising a hydrocarbon exploration and production company in defending a Commercial Court application by a sovereign state to set aside a UNICTRAL arbitration award.
  • – Acting for BNP Paribas in a dispute with NIDCO regarding claims pursuant to standby letters of credit.
  • – Acting for a UK law firm in defending a claim based upon alleged fraudulent activity by one of its partners in an overseas office.
  • – Advising a law firm in relation to an investigation (and related SRA issues) following the discovery of irregular financial conduct by one of its senior employees.
  • – Acting for a major private bank in relation to an LCIA arbitration, including obtaining a worldwide freezing injunction in support of an arbitration and a successful application for committal of the respondent.
  • – Acting for the United States Department of Justice in Section 25 Freezing Injunction proceedings in England in support of civil forfeiture proceedings in the US.
  • – Acting for a major CIS bank in its Supreme Court appeal against a prominent businessman, and in related proceedings in the British Virgin Islands.
  • – Acting for Rawlinson & Hunter Trustees SA, the trustees of the Tchenguiz Discretionary Trust in relation to complex multi-party proceedings in Guernsey involving claims for circa £160m.
  • – Acting for a private individual in defending a challenge pursuant to sections 68 and 69 of the Arbitration Act 1996 in relation to an arbitration of a trust dispute.
  • – Advising a major trust company in relation to potential claims for breach of trust in relation to fees incorrectly charged in relation to trusts.

  • – “Gareth Keillor is an exceptional litigator – solutions focused, responsive, bright and sensible.”
    THE LEGAL 500 UK 2022
  • – “One to Watch”
    PRIVATE CLIENT GLOBAL ELITE 2018, 2019 and 2021
  • – “Gareth Keillor is seasoned in a wide range of commercial disputes…has a laser-like focus on the clients’ needs”.
    SPEAR’S 500 2020.
  • – On Civil Fraud: “Gareth Keillor is extremely knowledgeable and thoughtful; has a lot of cross-border dispute resolution experience.”
    LEGAL 500 2020
  • – A “rising star” for London Private Clients
    LEGAL 500 2019
  • – “Very experienced and capable in offshore and in Russia/CIS/Ukraine matters”.
    LEGAL 500 2019
  • – “Gareth Keillor ‘is very experienced, thoughtful and level-headed’”.
    LEGAL 500 2019
  • – “Gareth Keillor is ‘bright, thorough, hardworking and is destined to become a major player in the contentious private client market’.”
    LEGAL 500 2019
  • – “Knowledgeable and responsive and is a very solid lawyer”.
    LEGAL 500 2019

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