With a ‘strategic and commercially minded’ approach, Dentons Ireland LLP is a go-to adviser for domestic and international clients across the pharma, tech, financial services, energy, real estate and media sectors, acting in a range of complex disputes. Co-head Karyn Harty is described as ’at the top of her game’, with stellar expertise across complex commercial disputes, regulatory issues and criminal investigations. Co-head Gareth Steen draws on extensive experience in litigation, with a particular focus on the financial services and real estate sectors, while Mark O’Shaughnessy is well-equipped to act in a range of TMT, life sciences, insurance, education and health sector claims.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Client satisfaction: Billing & efficiency
Client satisfaction: Sector knowledge
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
- ‘The team is very strategic and commercially minded, detail oriented and outcome focused. This is very much a team and the best players were always at my disposal, regardless of whether they were on the case on a day-to-day basis. They're very available and were invested in my interests.'
- ‘Gemma Freeman is a phenomenally dedicated and detail oriented professional who is 100% committed to understanding every inch of her brief. She continually out shone her counterparts on the other side to position us in the strongest possible way.'
- ‘Ciara Fitzgerald is a stand-out pragmatic problem solver, commercial with a sharp legal mind and interpersonal skills.’
- ‘Karyn Harty, Lesley Caplin and Tiernan Nix are all capable, calm and very knowledgeable lawyers who help steer clients through Irish litigation effectively. They are very good at ascertaining the client's priorities and offer practical, pragmatic advice to achieve their aims.’
- ‘I recently had the pleasure of working with Mark O’Shaughnessy on an issue with a client, and I was extremely impressed with how he managed the entire process. His professionalism and approach ensured a smooth resolution to a successful conclusion.’
- ‘Well informed, clearly communicated advice which they are always happy to discuss and develop. Ciara FitzGerald is an easy-to-work-with authority on litigation finance, and Aaron McCarthy consistently offers helpful insights on the wider context.’
Key clients
- BBC
- Ailmount Investments
- Ennovate and Bosai
- Unite the Union
- MonetizeAd
- SDI Henry Street Debs (Sports Direct)
- Savils
- Mezen Consultancy Services
- The IRONMAN Group
- Ailmount Investments
- Moneycorp
- MonetizeAd
Work highlights
Acted for Lazvisax, a minority shareholder in Web Summit’s parent company, in a high-profile Commercial Court dispute.
Advising BBC on two major Irish defamation cases: the high-profile Gerry Adams trial over a documentary, and a separate live broadcast case involving Ryan Casey’s victim impact statement.
Acted for the vendors of Davy Stockbrokers in a €60m SPA dispute with Bank of Ireland, involving deferred consideration and regulatory approval issues.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Practice head
Karyn Harty; Gareth Steen
Other key lawyers
Mark O'Shaughnessy; Gemma Freeman; Ciara Fitzgerald; Lesley Caplin; Tiernan Nix; Aaron McCarthy

