Cian O'Brien


Data Protection Commission Ireland

Deputy Data Protection Commissioner

Cian O'Brien was appointed Deputy Commissioner in May 2022, in a role that centres on all large-scale Data Protection Commission inquiries and investigations. Since joining the organisation in 2019, Cian’s roles in the DPC have included Legal Researcher and Senior Regulatory Lawyer. During this time, he was responsible for providing legal advice and assistance on large scale inquiries and investigations concerning both cross-border and domestic matters. Cian also acted as an advisor to the Inquiries Committee and oversaw and implemented the DPC’s process for confirming administrative fines in Court, as provided for in the Data Protection Act 2018. He graduated from University College Dublin and the Kings Inns Dublin. Cian was called to the Bar of Ireland in 2014. He practised law as a Barrister and tutored European Union law before joining the Data Protection Commission.


Contributions by Cian O'Brien

  • Complying with EU Data Transfer Requirements Since ‘Schrems II’
    Speaker at IAPP Data Protection Intensive: Deutschland 2023
  • Is Online Safety the New Privacy?
    Speaker at IAPP Global Privacy Summit 2023
  • International Forum on Privacy and Data Protection: Advances and regulatory challenges in a global society
    Speaker at Virtual Madrid KnowledgeNet: 17 May 2021