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A Powerful New Partnership for Wicklow
In December 2025, an exciting milestone was reached when Cullen O’Beirne merged into Sherwin O’Riordan LLP . This merger has created one of Wicklow’s most experienced and largest full-service law firms. By bringing these two storied practices together, we offer our business and private clients the specialised firepower of a city firm with the heart and accessibility of a local Greystones office.
Our Roots
From Dublin to the Heart of Greystones
Our story is built on decades of local trust and legal excellence:
Cullen O’Beirne was founded by Barry O’Beirne’s grandfather and established its deep roots in the Greystones community when Barry moved the practice from Inns Quay beside the Four Courts to its current office on the main street in Greystones in 2019.
Sherwin O’Riordan was founded by James Sherwin and David O’Riordan in 2002. Starting with their landmark office on Pembroke Road in Ballsbridge, they expanded to Eden Gate in Delgany in 2022, and are now proudly situated in the heart of Greystones.
Meet the Partners
With our highly experienced partners, James Sherwin, David O’Riordan, and Barry O’Beirne, supported by a team of solicitors, legal executives and legal interns, we can help. Whether you are navigating a complex commercial contract, moving into a new home, or seeking guidance on a personal matter, you have the direct support of some of the most respected legal minds in the country.
A Greystones Native at the Heart of the Firm
Partner James Sherwin, this isn’t just business it’s personal. As a Greystones native born and raised right here, James is deeply passionate about the Wicklow business community. His mission is simple: to ensure that Wicklow clients receive the highest possible standard of legal service without ever having to leave their own doorstep.
Partner Barry O’Beirne lives in Greystones, as a regular rugby fanatic at the Greystones matches; Barry has been helping local people navigate the complexities of running a business in Wicklow for many years, supporting clients with their personal injury matters and offering strategic counsel that balances legal rigor with practical reality.
A significant pillar of the firm’s offering is its specialised employment law department, led by David O’Riordan. Widely regarded as one of Ireland’s top employment law specialists, David brings a wealth of experience in navigating the increasingly complex statutory framework governing the Irish workplace. David is deeply passionate about helping businesses thrive by fostering stable and compliant working environments. Outside of the office, he is a dedicated sportsman with a particular affinity for cricket and rugby. This competitive spirit and appreciation for teamwork translate into his legal practice, where he approaches every case with strategic precision and a commitment to achieving the best possible outcome for his clients.
Why Choose Us?
We know that legal issues can be daunting. We are here to listen, to simplify the complex, and to stand in your corner.