Connor
Cassidy
Partner
Connor Cassidy is a partner in the Disputes and Investigations Group at Matheson.
Our Disputes and Investigations Group works closely with technical experts from our non-contentious practice areas, including the Technology and Innovation, Financial Institutions, Asset Management, Finance and Capital Markets and Corporate groups to ensure a seamless service which understands and meets our clients’ regulatory requirements and priorities.
Connor has over twelve years’ experience advising a variety of clients in complex disputes including alternative methods of dispute resolution, with particular expertise in technology / financial services disputes. Connor also advises clients on contentious regulatory matters, often involving a number of regulators, law enforcement authorities and jurisdictions. His clients include global technology companies, financial institutions, insurers, fund managers, fintech firms, directors, senior executives and shareholders and other regulated entities and persons.
His clients include global technology companies, financial institutions, insurers, fund managers, fintech firms, directors, senior executives and shareholders and other regulated entities and persons.
Connor has significant experience in handling complex regulatory investigations and advising on issues relating to legal professional privilege. His practice also includes advising clients in respect of white collar crime and corporate offences, fraud, anti-bribery and corruption compliance, as well as lobbying compliance under the Irish and EU regimes.
Connor has been consistently ranked as a key lawyer for White Collar Crime in Ireland by Legal 500. He was also named as the Lexology Client Choice Awards winner 2025 for Investigations in Ireland.
He has authored a number of publications including; The Practitioners Guide to Global Investigations (Irish Chapter) 2023; Global Investigations Review: Irish Chapter (2022); Getting the Deal Through: Financial Services Litigation 2020: Getting the Deal Through: Construction (White Collar Crime section) 2020; The Practitioners Guide to Global Investigations 2020 (Ireland); ICLG Business Crime; and Getting the Deal Through: Dispute Resolution 2020.
Connor joined the firm in 2016, having previously qualified and practised as a barrister at the Bar of Northern Ireland.
Experience and Education
Connor’s experience includes advising:
- a national healthcare provider in respect of an inquiry by the Irish Data Protection Commission resulting from a data breach incurred as a result of a cyber-attack.
- a global technology and social media company in respect of inquiries before the Irish Data Protection Commission.
- a global technology company in relation to complaint handling and engagement with the Irish Data Protection Commission under the amicable resolution procedure.
- a global vehicle manufacturer in respect of complex, multi-party, multi-proceedings, product liability litigation with estimated losses in excess of €60 million.
- a global technology company in relation to an internal investigation prompted by a protected disclosure made by a whistle-blower.
- multiple clients in the defence of data breach claims (including for non-material loss) under the GDPR.
- numerous clients across a number of industry sectors on potential fraud, bribery and corruption offences and reporting obligations under section 19 of the Criminal Justice Act 2011.
- a number of clients who have been the victim of cyber-attacks, including in respect of their regulatory engagement and litigation management post-incident.
- Managing the sole mandate for handling Irish consumer law claims for a number of clients operating in the technology, manufacturing and distribution sectors.
- a number of clients across various industry sectors with regards to warranty and indemnity claims under Share Purchase Agreements.
- various regulated financial institutions in investigations and enforcement proceedings (including the Central Bank of Ireland, the ODCE, and Financial Services and Pensions Ombudsman).
- a number of financial services providers in relation to administrative sanctions investigations under the Central Bank’s regulatory enforcement regime.
- Queen’s University Belfast, Law LLB, First Class Honours, 2007 – 2010
- Institute of Professional Legal Studies Northern Ireland, Bar Course, Distinction, 2011-2012
- Law Society of Ireland, Qualified Lawyers Transfer Test, 2016
