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Byrne Wallace Shields LLP

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LK Shields Solicitors LLP and Byrne Wallace LLP merged at the beginning of 2025 to form Byrne Wallace Shields LLP, renowned for assisting public and private sector clients in safeguarding their reputations. The team offers proactive support in mitigating the impact of events, such as product recalls, data breaches, cyber-attacks, and negative media attention. Beyond these areas, the firm also focuses on assisting clients in removing defamatory content from social media platforms and handling trademark misuse or impersonation cases. Practice head Mark O’Shaughnessy provides strategic guidance to local and global organisations navigating intricate legal conflicts, specialising in corporate and shareholder disputes, intellectual property issues, and insurance-related matters.
Legal 500 Editorial commentary

Testimonials

Collated independently by Legal 500 research team.

  • ‘Mark O’Shaughnessy is very supportive. He is always willing to share his expertise and knowledge with his solicitor colleagues. He prepares well, and his presentations are engaging, on point and relevant.'
  • ‘My experience has been that Byrne Wallace Shields has a very responsive team. Clarity and description of issues and advice is clear and concise.’
  • ‘Mark O’Shaughnessy is helpful, engaging and professional.’
  • ‘The Byrne Wallace Shields team stands out for their deep industry knowledge and approachable style. They take the time to understand each client's unique needs, have a collaborative approach, and genuinely care about building strong relationships.’
  • ‘Any individuals within the Byrne Wallace Shields team have great knowledge, and their responsiveness and strategic thinking make them invaluable partners. Mark O’Shaughnessy has demonstrated in-depth sector knowledge and a client-centric approach.’
  • ‘Classical law firm, good communication.’
  • ‘Mark O’Shaughnessy is responsive and to the point.’

Key clients

  • Nielsen Ireland
  • Irish Studio Media Publishing Limited

Work highlights

Advised a financial institution on a large number of defamation proceedings in the High Court and Circuit Court.
Advised a state body on multiple sets of High Court defamation proceedings.
Assisted an asset management firm with the reputational issues associated with allegations from a high-profile individual.

Practice head

Mark O’Shaughnessy

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