Declan Black

Managing Partner

Declan is the Managing Partner of Mason Hayes & Curran. His personal expertise is in the resolution of business disputes and the management of insolvency risk. He focuses on advising on disputes and investigations with significant reputational and financial consequences for the protagonists and has acted in many high-value matters, commonly with an international component.

He advises regularly regarding warranty claims flowing from corporate transactions, claims against institutional investment advisors, claims in the financial services sector, shareholder and boardroom disputes and agency matters.

Declan has also represented both plaintiffs and defendants on negligence claims involving professionals such as insurance brokers, accountants, solicitors and investment advisers. He has also acted in property related disputes, fraud-related litigation and in a number of disputes involving the application of EU regulations and directives in Ireland. He has represented Tribunals of Inquiry established by the State in proceedings taken against the Tribunals by persons affected by their actions.

Declan also represents stakeholders, most commonly financial institutions, in corporate insolvency matters including consensual restructurings, examinerships, receiverships, schemes of arrangement and liquidations. Allied to this practice, he advises boards and individual officers regarding the management of insolvency risks. 


  • Commercial litigation
  • Insolvency

Representative Matters

  • Representing majority shareholders in multi-faceted shareholder dispute in substantial Irish corporate entity.

  • Acting for Facebook in legal proceedings commenced by the Irish Data Protection Commissioner in the High Court of Ireland asking the Irish Court to seek a preliminary reference ruling from the Court of Justice of the European Union (“CJEU”) on the validity of the EU Commission decisions which permit data transfers from the EU to the United States pursuant to standard contractual clauses.

  • Representing the Tribunal of Inquiry into certain Payments to Politicians and Related Matters (The Moriarty Tribunal) in a series of proceedings taken against it by Denis O’Brien, Dermot Desmond and others.


Chambers & Partners, 2021

As an 'Eminent Practitioner', Declan “has a fantastic amount of experience”.

Legal 500, 2021

One of the very top litigation solicitors in the Irish market.

Speaking Engagements & Teaching

Declan regularly speaks on a variety of management, litigation and insolvency related topics.

  • LinkedIn

Areas of Expertise

Dispute Resolution Commercial Disputes Financial Services Disputes Insurance and Risk Restructuring & Insolvency Inward Investment International Business Brexit

Professional Memberships

International Bar Association

The Irish Society of Insolvency Practitioners


University College Dublin (BCL)