Leigh Mallon

Leigh Mallon represents leading corporate clients and institutions in high-value, complex commercial litigation and international arbitration matters, as well as in a broad range of regulatory matters including competition and antitrust investigations; white collar crime and enforcement; special investigations; and compliance monitoring. Leigh's work frequently involves the coordination of multiple proceedings, arbitrations and investigations across a number of jurisdictions.

Leigh's commercial litigation matters commonly involve breaches of fiduciary duties, professional negligence and shareholder claims. He conducts arbitration proceedings under the rules of the leading international arbitration institutions, including the International Chamber of Commerce (ICC), the London Court of International Arbitration (LCIA), the Singapore International Arbitration Centre (SIAC) and the Hong Kong International Arbitration Centre (HKIAC). Leigh also frequently advises on the enforcement of arbitral awards in foreign jurisdictions and the New York Convention.

Leigh's regulatory work includes acting for clients in matters concerning white-collar crime and enforcement. He conducts special investigations, compliance audits and compliance monitoring work for national and multinational companies to assist in the detection and elimination of potentially unlawful conduct as well as evaluating the strength of company policies and procedures. He also assists clients with respect to dawn raids by finance, competition and corruption regulators.

Leigh's privacy work includes representing corporate clients in privacy and cybersecurity-related investigations, enforcement actions and responses. He regularly advises clients facing investigations commenced by European data privacy regulators including most recently in Denmark, Norway, Spain and the United Kingdom. He also has experience representing clients in responding to Data Subject Access Requests and civil proceedings commenced by data subjects. Leigh advises all types of clients handling global responses to cybersecurity breaches including crisis responses, risk mitigation and managing notifications to regulators and data subjects.

During his career Leigh has previously been seconded to a large investment bank where he worked across their London and New York offices and advised on corporate and investment banking litigation and arbitration matters, as well as internal regulatory and compliance investigations.

Leigh is recognized by Legal 500 UK as a rising star in Commercial Litigation. He is also recognized for International Arbitration. He is noted as a 'highly skilled' and 'strong litigator, able to master highly complex disputes' and as 'extremely competent, smart, thorough, well organised and a quick-thinker'. Clients also say 'Leigh is brilliant and is able to quickly identify the issues that will determine a dispute and prepare a successful case strategy' and that 'Leigh’s professional, hands-on approach to the case and his organization skills are unique', and prize him for 'strong strategic and analytical skills and knows what clients want'.