Strategic Research Sponsor of the American Bar Association's Section of International LawThe Queen's Award for Enterpise 2012

James Gilbey

James Gilbey
St Katharine's Way
+44 20 7063 4098


Who's Who Legal Arbitration: Expert Witnesses

James Gilbey qualified as a chartered accountant with the Institute of Chartered Accountants in England and Wales (ICAEW) in 2003. Since then he has specialised in the provision of forensic accounting services to solicitors, regulators and corporates, having worked for a boutique financial advisory practice before becoming a partner at Mazars LLP in 2013. Mazars is a global partnership providing audit, tax and financial advisory services in over 70 countries.

James has been instructed as an independent expert accountant on numerous occasions. He has experience of providing clear and robust expert reports, and giving evidence under cross-examination, in a wide range of matters. He has particular expertise in providing opinions on the quantification of loss caused by, for example, breach of contract, misrepresentation, reliance on inappropriately prepared financial records or accounts, and breaches of competition regulation. A significant part of James’ work therefore centres on valuations in the context of disputes. This often requires the review of voluminous financial records and the preparation of complex financial models to assess loss. His opinions in this area have withstood rigorous cross-examination across different dispute forums and in different locations around the world. He has been instructed in respect of state v state disputes and investment treaty arbitrations, in international arbitrations, and in disputes heard before the High Court and the first-tier tax tribunal in the UK. He has also been required to give evidence “hot tubbing”.

James also undertakes a number of significant investigations in the context of fraud, bribery and corruption, and insider trading. In these areas he has provided his expertise in respect of investigations undertaken by the Financial Conduct Authority and the Serious Fraud Office in the UK, and the Department of Justice and the Securities and Exchange Commission in the US.

The expert witness assignments and investigation assignments undertaken by James cover a wide range of sectors. Lately a significant number of the matters James has been instructed on relate to the energy sector (both non-renewable and renewable). In addition to his work in the energy sector, James has significant experience of disputes relating to, inter alia, the financial services, utilities, transport and logistics, real estate, and hotel and leisure sectors.

James is a fellow of the ICAEW, a member of the ICAEW valuation special interest group, and a member of the ICAEW president’s appointment scheme for expert determination.

WWL says: James Gilbey “has the drafting and testifying skills to put him comfortably in the top tier of expert witnesses”, according to respondents, who also regard him as “an extremely diligent and hardworking individual”.

This biography is an extract from Who's Who Legal: Arbitration which can be purchased from our Shop.

Other Practice Areas:

Follow us on LinkedIn

Practice Areas


Browse Firms

Search Firms

The Who's Who Legal 100


News & Features

Special Reports



About Us

It is not possible to buy entry into any Who's Who Legal publication

Nominees have been selected based upon comprehensive, independent survey work with both general counsel and private practice lawyers worldwide. Only specialists who have met independent international research criteria are listed.

Copyright © 2017 Law Business Research Ltd. All rights reserved. |

87 Lancaster Road, London, W11 1QQ, UK | Tel: +44 20 7908 1180 / Fax: +44 207 229 6910 |

Law Business Research Ltd

87 Lancaster Road, London
W11 1QQ, UK