Thomas is a Founding Partner of the Paris office of Signature Litigation and specialises in international and commercial litigation.
With over 30 years’ experience in litigation, Thomas represents French and international corporates and financial institutions in international commercial disputes. Previously a Partner in a major international law firm, Thomas joined Signature litigation in 2019.
Thomas has a particular focus in high-stakes disputes involving complex legal issues. His multi-faceted expertise encompasses several industry sectors including automotive, aviation, banking and technology industries.
Thomas is particularly known for his expertise in cross-border litigation, having coordinated many large-scale international disputes and conducted numerous international enforcement proceedings.
Thomas is also involved in civil fraud and asset tracing, corporate, unfair competition and product liability disputes.
Thomas is highly ranked across the Chambers and Partners Guides; he is ranked as a leading expert by Chambers Global and Chambers France 2026 for his litigation and aviation expertise, describing him as a “go-to lawyer in France.” Sources from previous guides praise his “invaluable” advice, experience and knowledge. They further note that Thomas is “an excellent litigator with great commercial awareness” and clients describe him as “spectacularly intelligent” as well as noting that he “takes the time to understand the strategic needs of our business and beyond that he is a very pleasant individual, the full package.” Another client also adds that his “strength is to focus on the details and to be extremely closely involved in directing proceedings.”
The Legal 500 EMEA Guide 2026 ranks Thomas in its ‘Hall of Fame’ for his aviation and commercial litigation practices, and he is also recommended for insurance. Thomas is described as an “outstanding trial lawyer” and clients “appreciate his pragmatic judgement and the reliability of his strategic assessments, which are consistently borne out in practice.” Previous editions of the Guide note that Thomas is “a leader in commercial litigation in France” “demonstrates rare versatility” and is “an excellent strategist in complex cases” whose “recommendations take into account in-depth understanding of his clients’ strategic and commercial issues.” Another referee praises Thomas as “a lawyer mastering legal matters with strategic dimension.”
Recognised by Lexology Index as the “finest product liability lawyer in the country and one of the very best on the continent”, Thomas has a seasoned, wide and multifaceted practice, spanning from contract litigation to corporate and banking disputes as well as to fraud and asset tracing. Thomas has been regarded by Lexology Index as one of two ‘Global Elite Thought Leaders’ in France for Life Sciences: Product Liability, and the directory notes he is a “standout figure in the life sciences market.” Previous editions of this directory has also praised Thomas for his “tough style that is very effective.” In Lexology Index’s Product Liability Defence 2022 Guide, Thomas is recognised as one of its ‘Global Elite Thought Leaders’, who is “highly respected by peers and clients alike for his extensive experience in complex product liability cases.”
Thomas has also been listed as one of the ‘Most Highly Regarded’ practitioners in Lexology Index: Product Liability Defence, which notes that he is “a pre-eminent figure in the French market.” He is an expert in international, cross-border litigation. Thomas “is very client-focused, very pragmatic, and creative with solutions” (Acritas clients survey, 2018). In the Lexology Index Insurance and Reinsurance 2022 Guide, Thomas is ranked as a ‘Thought Leader’ with the guide noting he “has a sterling reputation in the market thanks to his experience in litigation proceedings, particularly those involving the life sciences sector” and “is a well-established name in the insurance market, held in high esteem by peers for his first-tier work on contentious matters.”
Thomas serves as Chair of the Superior Appellate Commission of the French Football Federation (FFF). He is also a past member of the Board of the International Association of Defense Counsel (IADC).
Prior to co-founding the Paris office of Signature Litigation, Thomas was a partner at Hogan Lovells.
Thomas is admitted to the Paris Bar. He is a fluent English speaker and a native French speaker.
Commercial Litigation
- Representing a multinational financial services group in relation to two separate complex and multi-disciplinary coverage claims against pools of leading insurers arising from class action claims filed in North America and Europe and involving the so-called IBOR and Gold Fixing investigations. The value of each claim is several hundreds of USD millions.
- Representing Foundation Saint-Louis, which hosts the assets of the former French Royal family, in defending against a claim initiated by the Comte de Paris (“Earl of Paris”) and concerning the ownership of Castle of Amboise, one of the most famous castles in France. The dispute is of immeasurable value and it received widespread media coverage.
- Representing Société Générale, a global investment bank, in the English Court defending declaratory proceedings brought by Clifford Chance following Société Générale’s EUR 500m professional negligence claim for alleged mishandling of a dispute with Turkish jewellers, Goldas Kuyumculuk Sanayi Ithalat Ihracat AS, and other companies in the same group.
- Representing a European premium television channel in a dispute valued in excess of EUR 300m concerning alleged breaches of competition law relating to allocation rights for popular entertainment programmes.
- Representing a European digital insurer in a shareholders’ dispute with a leading reinsurance company concerning business diversion and use of confidential information to gain competitive advantage. The dispute is valued at hundreds of EUR millions.
- Representing a major US company operating an online platform for short and long-term homestays in various regulatory and civil liability disputes before the French courts against individuals, companies and local authorities.
- Representing a leading sports regulator in a EUR multi-hundred million dispute with a multinational telecommunications company arising out of a sponsorship agreement in relation to major sports competitions and involving allegations of bribery and corruption.
- Advising a subsidiary of a large LATAM mining company in relation to a USD 120m claim under a “Terrorism” insurance and risk insurance policy following violent and property damaging public riots in New Caledonia.
- Representing a leading European retail group in a pioneering dispute arising out of the French Corporate Duty of Vigilance Law 2017 and initiated by a group of NGOs. The case involves allegations that the company’s overseas subsidiaries contribute to environmental risks through insufficient monitoring of its suppliers. The value of the claim exceeds EUR 70m.
- Representing a nuclear plant operator in a EUR 30m dispute with a European investment bank concerning the call of a first demand bank guarantee issued in connection with a project for building an extension to the nuclear plant.
- Assisting a French luxury goods manufacturer in disputes deriving from the breach/termination of selective distribution agreements.
- Representing a global spirits company in pre-contentious negotiations to reach a settlement agreement to resolve a dispute arising from the termination of a sponsorship contract with a major sports club.
- Representing a leading provider of offshore energy solutions in an unfair competition dispute against a competitor.
- Representing leading providers of decarbonised mobility solutions and of nuclear solutions in disputes deriving from the termination of joint-venture agreements.
Product Liability
- Representing Renault in worldwide investigations and proceedings relating to NOx diesel emissions, including international coordination and assistance, specifically, in relation to Nox Diesel Emissions Group Litigation in London, a claim of unprecedented scale in the English court, in which more than 1.6 million claimants have issued claims against car manufacturers (and others).
- Representing a US manufacturer of automotive parts in a dispute with a multinational automotive manufacturer concerning alleged defective engine parts. The dispute is worth in excess of EUR 100m.
- Representing a US manufacturer in a EUR 50m dispute over the supply of allegedly defective gas product to a French utility.
- Representing a leading French automotive manufacturer in French group civil proceedings and related investigations concerning allegations of oil issues and related alleged engine failures.
Banking and Financial Markets
- Representing an Austrian bank as the defendant in a EUR 325m dispute before the French Courts commenced by a French fund and concerning the annulment of the sale of subordinated participation capital bonds based on alleged fraud. This case involved an over 10-year court battle and was referred three times to the Court of Cassation, the highest Court in France for civil matters.
Civil Fraud, Asset Tracing and Recovery
- Representing a CIS bank in a high-profile case against the bank’s former owner in a EUR 1bn judgment enforcement proceedings involving piercing the corporate veil and attachment of numerous high-value assets located on the French Riviera and in the French West Indies.
- Representing an international group providing industrial services in pre-emptive actions to prevent the enforcement of adverse US-decisions and in the recognition and enforcement in France of English High Court judgments.
- Representing a French video-sharing platform in connection with the enforcement in France of unfavourable judgments handed down by the Italian courts and obtaining the release of several protective attachments with up to EUR 100m at stake.
Commercial Litigation – Aviation
- Representing a US aircraft manufacturer in the defence of personal injury claims arising from major aircraft accidents before the French courts. The total value of claims was hundreds of USD millions.
- Representing an international aircraft engine manufacturer in a EUR 30m dispute arising from a plane incident.
Competition law/Antitrust
- Representing a French advance materials manufacturer in a follow-on civil action arising out of a decision by the European Commission regarding participation in a cartel.