Entrusted by significant domestic and international companies, financial institutions, regulatory authorities, government agencies, and private individual clients, Arthur Cox’s key strengths lie in advising clients across all stages of regulatory and criminal enforcement processes, from investigations to prosecutions. It is particularly noted for its experience in handling fraud-related litigation. Joanelle O’Cleirigh heads the practice and is noted for handling whistleblowing and anti-bribery matters. Co-head Richard Willis is well-versed in conducting cross-border data and information governance processes.

Legal 500 Editorial commentary

Testimonials

Collated independently by Legal 500 research team.

  • ‘Helpful and approachable always.’
  • ‘Richard Willis always makes himself available, deeply understands the client's needs and works exhaustively to address new and varied issues as they arise.’
  • ‘Our "go to" firm for large-scale discovery matters and complex litigation. The team is highly effective and skilled and takes a collaborative approach when dealing with us. The team can turn around and deliver clear and practical advice on complex issues on short notice. Extremely responsive.’
  • ‘Deirdre O'Mahony is a stand-out lawyer on the Arthur Cox team. Her advice is second to none. She provides clear, well-thought-through and pragmatic advice and is an expert. She is extremely responsive, has an excellent attention to detail and is a pleasure to deal with.’
  • ‘Joanelle O'Cleirigh brings vast insight, adopts a practical approach and has relevant experience with appropriate industry knowledge.’
  • ‘Specialists in their field.’
  • ‘Diverse and experienced team of lawyers.’
  • ‘Highly experienced and expert in their area of specialism.’

Key clients

  • Deloitte Ireland LLP
  • Religious Sisters of Charity
  • R.E. Administration (In Liquidation) Limited
  • Hears Technology Limited
  • SynerySuite
  • OHM Group
  • Aga Khan

Work highlights

  • Advised Eir on the first ever case to test the investigative powers of Commission for Communications Regulation under the new legislative regime.
  • Represented Ulster Bank Ireland DAC in three statutory appeals to the High Court contesting decisions of the Financial Services and Ombudsman under the Financial Services and Pensions Ombudsman Act 2017.
  • Represented Deloitte Ireland LLP in various issues, including a High Court action by a former audit client, the Football Association of Ireland.

Lawyers

Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Practice head

The lawyer(s) leading their teams.

Joanelle O’Cleirigh, Richard Willis

Other key lawyers

Deirdre O'Mahony