
Highly regarded for its deep expertise across the telecoms sector, McCann FitzGerald LLP’s team regularly advises its varied client base on a wide range of contentious, regulatory and transactional mandates. In particular, the team is well-equipped to assist clients with cutting edge projects, ex-ante competition regulation and strategic regulatory advice. With specific capabilities in contentious and regulatory matters respectively, Rosaleen Byrne and Laura Treacy co-head the team. Catherine Derrig and Amy Brick also stand out as key contacts for contentious telecoms matters, while Garreth O’Brien is a strong choice for transactional and advisory work.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Testimonials
Collated independently by Legal 500 research team.
- ‘Marie-Alice Cleary and Catherine Derrig always seem to be a few steps ahead and able to identify any potential challenges and develop strategies to mitigate any risks. The attention to detail is second to none and it shows in the work they provide.’
- ‘Because of the resources available, and depth of knowledge and experience, appropriate individual lawyers can be assigned to particular cases and projects, depending on the characteristics of the work and the specific requirements. The accessibility to advisers, including partners, is exceptional.’
- ‘Rosaleen Byrne combines a wealth of knowledge and experience in general litigation practice, with a deep knowledge and understanding of our (complex) industry, meaning that the delivery of her advice is bespoke, expedient, well-informed, and of real practical application and benefit.'
- ‘The team continues to deliver expert, strategic advices applying their depth of knowledge of the evolving industry.’
- ‘We work extensively with partners Rosaleen Byrne, Catherine Derrig, Amy Brick and the excellent Marie-Alice Cleary. They all continue to outshine others in this area with their depth of knowledge of the evolving industry.’
- ‘This is the go-to firm for Telecoms disputes in Ireland. They know exactly how to navigate around complex issues and deliver the best possible outcomes for their clients.’
- ‘Rosaleen Byrne, Catherine Derrig, Amy Brick and Marie-Alice Cleary: I have worked with them closely in extremely sensitive and complex disputes and there are no lawyers who compare to them in their field. They are intelligent, practical, experienced, knowledgeable and masters at what they do.’
- ‘Catherine Derrig is well-placed to deal expertly with telecoms litigation.’
Key clients
- ComReg
- AMP Capital Investors (UK) Limited
- ESB
- Speed Fibre Group DAC/Cordiant Digital Infrastructure
- TP Global Finance Limited
- Vodafone
Work highlights
Acting for ComReg in its referral of an enforcement matter for adjudication under a new legislative regime.
Acted for ComReg in its investigation and finding of non-compliance against Virgin Media and its subsequent successful Commercial Court proceedings in which non-compliance by Virgin Media was found by the High Court for a failure by it to ensure that its conditions and procedures for contract termination do not act as a disincentive to consumers changing service provider.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Practice head
Rosaleen Byrne; Laura Treacy
Other key lawyers
Catherine Derrig; Garreth O'Brien; Amy Brick; Marie-Alice Cleary
