Declan Black

Managing Partner

Declan is the Managing Partner of Mason Hayes & Curran. His personal practice focuses on commercial litigation and insolvency. Declan's experience includes the management of disputes and investigations with significant reputational consequences for the protagonists. He has acted in many high-value contractual and tortious disputes, commonly with an international component.

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

Declan has also represented both plaintiffs and defendants in relation to 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 clients, most commonly financial institutions, in complex corporate insolvency matters. These include examinerships, receiverships, schemes of arrangement and liquidations. Allied to this practice, he advises boards and individual officers regarding their responsibilities


  • Commercial litigation
  • Insolvency

Representative Matters

  • 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.
  • Representing Eversheds in a dispute against Dunnes Stores.


Chambers Global, 2018

Declan has a “wealth of experience under his belt; he knows how to read a situation and find the right solution." He has a formidable reputation for dispute resolution matters.

Chambers and Partners, 2017

Dispute Resolution: “Very sharp, he is the standard all lawyers should aspire to.”

Insolvency & Restructuring: "A good operator, who is efficient." 

Speaking Engagements & Teaching

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

  • Google+
  • LinkedIn

Areas of Expertise

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

Professional Memberships

International Bar Association

The Irish Society of Insolvency Practitioners


University College Dublin (BCL)