Catherine Allen


Catherine leads our Public, Regulatory & Investigations team. She is a public and information law specialist and is recognised as a leader in her field by the Legal 500 directory. Catherine advises a range of regulators on their public law, judicial review and information law work. She is particularly well-known for her work in the areas of investigations and fair procedures. She is a specialist in judicial review proceedings and regularly advises public bodies on their powers and duties, as well as acting for those seeking to challenge the decisions of public bodies.

Catherine heads our Professional Regulatory group, managing some of the team’s most complex investigations and presents cases before Fitness to Practise Committees.

Catherine has particular expertise in information law as it relates to public and third sector bodies, including advising on the FOI Act and the General Data Protection Regulation.  


  • Public and Administrative Law
  • Regulatory Law
  • Professional Disciplinary Law
  • Litigation
  • Freedom of Information and Data Protection

German Practice:

In addition to her administrative and public law practice, Catherine Allen assists many German clients of Mason Hayes & Curran on a variety of legal issues. She works closely with other departments of the firm in this regard. She actively maintains links with German legal and commercial entities, and is an honorary member of the German Irish Lawyers and Business Association.

Representative Matters

  • Representing the Health Insurance Authority in its recent statutory appeal and judicial review proceedings regarding health insurance for non-EEA students ordinarily resident in the State. Read more
  • Representing the CEO of the Nursing and Midwifery Board of Ireland and the Medical Council on fitness to practise inquiries.
  • Advising many public sector and third sector bodies on compliance with the General Data Protection Regulation, including the specific requirements that apply to public bodies when processing personal data.


Legal 500, 2021

Catherine is ranked as a ‘Leading Individual’ and possesses “encyclopaedic knowledge of public sector law.”

Legal 500, 2020

Catherine is recognised as a “Leading Individual”

Speaking Engagements & Teaching

  • Professional Regulatory and Disciplinary Law Seminar (February 2019)
  • 'GDPR and Professional Regulators’, MHC/Professional, Regulatory & Disciplinary Bar Association (February 2019)


Regulation of the Legal Profession in Ireland: Overview (Thompson Reuters, 2017)

Legal Systems in Ireland: Overview (Thompson Reuters, 2017)

  • LinkedIn

Areas of Expertise

Public, Regulatory and Investigations Charity Law & Not-for-Profit Dispute Resolution General Data Protection Regulation

Professional Memberships

Association of Regulatory and Disciplinary Lawyers

German Irish Lawyers and Business Association (Honorary Member)

British German Jurists' Association


University College Dublin, BCL European Legal Studies

University of Würzburg, Germany, LLM

Honorable Society of King's Inns, Advanced Diploma in White Collar, Corporate and Regulatory Crime

Honorable Society of King’s Inns, Advanced Diploma in Legislative Drafting