E: dmahon@harcusparker.co.uk

David joined the firm in 2023. David is a New Zealand qualified lawyer, being admitted as a Barrister and Solicitor of the High Court of New Zealand in 2014. David has worked for leading firms in both UK and New Zealand as well as working for the Competition and Markets Authority. David has experience acting for claimants, defendants and public authorities.

Legal Expertise

David has experience in a range of competition, public and regulatory matters in the Competition Appeal Tribunal, High Court, and Court of Appeal.
In New Zealand, David acted for companies and individual directors being investigated by the New Zealand Commerce Commission. Since moving to the UK David has advised public bodies in relation to competition and procurement issues and developed a strong claimant focused competition practice.

David was involved in and advised the CMA on various pieces of litigation, including some of the appeals against the CMA’s abuse of dominance decisions against pharmaceutical companies and in relation to penalty decisions against two major retailers for failing to comply with Interim Orders imposed as a part of a merger inquiry. David played a leading role developing the landmark competition claims against water companies in the UK.
David currently plays a leading role in the large scale CICC collective proceedings against Visa and Mastercard in the Competition Appeal Tribunal.

Accreditations and Memberships

David was a contributing author of the abuse of dominance chapter in Private Enforcement of Competition Law database (Kluwer).

David is a member of the Competition Lawyers Association and the Collective Redress Lawyers Association.

David holds an LLM in competition and public law as well as an LLB(hons) and BA.

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