William Dillon-Leetch


William is a partner in our Corporate team. His practice includes mergers & acquisitions, corporate advisory work, fundraisings, venture capital, joint ventures, corporate reorganisations and IPOs.

William advises clients across the energy, pharmaceutical, technology, finance, aviation and real estate sectors.

William joined Mason Hayes & Curran in 2018 having extensive domestic and international experience, including with the corporate department of US global law firm K&L Gates in Sydney.


  • Company Law

  • Mergers and Acquisitions

  • Corporate Finance

  • Private Equity

  • Inward Investment

  • Corporate Structures and Re-organisations

  • Joint Ventures and Shareholder Arrangements

  • Venture Capital

Representative Matters

  • Advising Fane Valley Co-Operative Society Limited on its acquisition of Robert Smyth & Sons Limited, including its subsidiary company, Burke Shipping Services Limited, from Donegal Investment Group plc for €17.25 million.

  • Advising Kennedy Wilson on the sale of the Portmarnock Hotel and Golf Resort to Northland Properties for €49 million.

  • Advising the Department of Communications, Climate Action and Environment on the contract for the implementation of the National Broadband Plan, a policy initiative of the Irish government, to deliver High Speed Broadband to every citizen and business in Ireland and to those parts of Ireland where the commercial sector has not had concrete plans to invest.

Speaking Engagements & Teaching

William is a frequent guest speaker at lectures on corporate law at the Law Society of Ireland.

  • LinkedIn

Areas of Expertise

Corporate Law Mergers & Acquisitions Company Law Private Equity and Venture Capital

Professional Memberships

Law Society of Ireland

Law Society of England and Wales (non-practising)

Law Society of New South Wales (non-practising)


Trinity College Dublin, LLB

The London School of Economics and Political Science, LLM