About us
McCann FitzGerald LLP
With over 600 people, including almost 400 lawyers and professional staff, McCann FitzGerald LLP is one of Ireland’s premier law firms. We offer expert, forward-thinking legal counsel to clients in Ireland and internationally. The firm is a full-service firm, divided broadly into four main groupings of corporate, finance, disputes and real estate (including construction). We also operate industry sector and specialist practice groups are comprised of professionals from different departments.
Meet our team in Toronto
We would be delighted to arrange a meeting between our teams during the IBA Conference to explore potential synergies and discuss ways in which we can collaborate.
If you are interested in meeting our team, please click here to select your preferred meeting times. You can also contact our IBA Coordinator, who will be in touch with you to make the necessary arrangements.

Stephen Holst
Managing Partner MCCANN FITZGERALD LLPStephen is our Managing Partner.
Before commencing as Managing Partner, Stephen had many years’ experience as a strategic adviser at the highest level in client organisations, guiding them on the people aspects of their significant corporate transactions, organisational change and most critical disputes. Stephen has specialist skills in whistleblowing and investigations into protected disclosures and white-collar crime. He has significant expertise in the employment and industrial relations aspects of acquisitions, mergers, outsourcings, procurement and restructurings; including on redundancy law, union issues, consultation and TUPE.

Niall Best
Partner CorporateNiall specialises in advising indigenous and multinational corporate clients on their activities in Ireland. He also regularly advises private equity sponsors and financial institutions in relation to acquisitions, disposals and restructurings.
His practice includes transactional work, such as mergers and acquisitions, corporate restructurings and reorganisations, joint ventures and commercial contracts. He also undertakes a wide range of advisory work, advising on private company law issues and corporate governance matters.

Rosaleen Byrne
Partner LitigationRosaleen has 25 years’ experience handling complex and large scale commercial disputes across a range of sectors, specifically financial services, communications, pharmaceutical, aviation and pensions. Her commercial disputes practice focuses on cases with a regulatory, or economic aspect and encompasses investigations, statutory inquiries and enforcement actions. Rosaleen is renowned for advising stakeholders on complex disputes in regulated sectors. Rosaleen also has considerable experience of handling data protection and privacy disputes and anti-trust cases including state aid litigation and follow on damages actions. Rosaleen has litigated on behalf of clients in a wide range of different fora, primarily in the Commercial and Competition Divisions of the High Court of Ireland and before specialist tribunals. Many of Rosaleen’s cases involve a Pan-European or International dimension.

Catherine Derrig
Partner LitigationCatherine is a very experienced litigator who advises public and private sector clients in contentious matters, with her practice covering a broad range of complex commercial and regulatory disputes. Her work is often multi-jurisdictional in nature and she works closely with international lawyers. Catherine has particular expertise in the banking and financial services, insurance, communications, health, energy and aviation sectors. She also has considerable experience of contentious competition matters.
Catherine advises corporates, financial institutions and insurers in connection with a wide range of commercial disputes, shareholder disputes, as well as disputes with customers and intermediaries. She has extensive experience of handling complex professional negligence claims in several fields, retained by both professionals and their insurers.
Catherine also acts for a number of regulators advising on statutory duties, decision making processes, statutory appeals, judicial reviews and enforcement action.
Catherine also advises entities who are the subject of regulatory action and those carrying out internal investigations, ranging from in-house company investigations concerning business ethics to regulatory enforcement investigations in relation to suspected illegal activity. Catherine also advises on dawn raids in a variety of sectors.
Catherine is a Founding Member and Secretary to the Irish Chapter of the Women’s White Collar Defence Association (WWCDA).

Iain Ferguson
Partner Head of Investment Management GroupIain is Head of the firm's Investment Management Group.
Iain has significant expertise in structuring, establishing and advising on a wide range of UCITS/AIFs including structured products, hedge funds, ETFs, loan/credit funds, real estate funds, private equity funds and infrastructure funds. Iain has also practiced in a leading international asset management and investment banking business. He chairs the Irish Funds’ Front Office Steering Group and is a member of the Irish Funds’ ETF Working Group and Real Estate Working Group.
He advises major global fund promoters and asset managers, investment banks, wealth managers, family offices, custodians and international prime brokers in connection with their Irish authorised fund activities.

Josh Hogan
Partner FinanceJosh is a partner in the Financial Services Regulation and FinTech practice. He has wide experience advising financial services providers and other clients on regulatory and FinTech matters, including banking, investment services, payment services, electronic money services, consumer/SME finance, authorisation and compliance issues, regulatory investigations, remediation and redress projects, anti-money laundering and sanctions.
Josh is an officer of the Banking & Financial Law Committee of the International Bar Association. He is an Expert with P.R.I.M.E. Finance, a prestigious panel of recognised international market experts in finance. Josh is on the Governing Council of the Fintech & Payments Association of Ireland, an affiliate of the Banking & Payments Federation of Ireland; he co-chairs its Regulatory Insights Group and Crypto Working Group, in which capacity, he attends regular meetings with the Central Bank of Ireland. Josh is a member of Blockchain Ireland. In 2024, he provided legal input on an Irish Funds Digital Asset Project Group’s examination of the tokenisation of financial instruments. Josh is a member of the Institute of Banking. He has experience working as an in-house lawyer at an international bank and in the Government Department of Finance.
Josh is recognised as a Market Leader by IFLR1000 for Financial Services Regulation, a Leading Partner in Legal500, Recommended in Who’s Who Legal and is ranked Band 1 in Chambers FinTech.

Gary McSharry
Partner Head of New York OfficeGary is Head of the New York office of McCann FitzGerald.
Gary advises on complex corporate transactions including public and private M&A, corporate inversions, loan portfolio acquisitions, ECM, reorganisations, corporate governance and joint ventures. Gary has also spent several years in New York where he has developed particular skills in advising US and international clients on Irish M&A and the establishment of Irish operations.

Éamon Ó Cuív
Partner FinanceÉamon advises clients on a wide range of finance matters including debt capital markets, structured finance, securitisation and corporate lending transactions for financial institutions, alternative lenders, non-financial corporates and state-owned entities.
Éamon has also been a lead adviser on many of the key landmark green and sustainable finance initiatives in Ireland over the past few years, including the issuance of Ireland’s first Green Bond in 2018 and a number of green and sustainability linked loans and private placements.
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