Muireann Dennehy


Muireann is a partner in our Dispute Resolution team. She is also a member of our Investigations & White Collar Crime team. Her practise focuses on corporate investigations and civil and regulatory fraud, alongside which she maintains a broad commercial litigation practice.

Muireann has considerable expertise in conducting high profile, cross-jurisdictional, investigations and her practice focuses in particular on the financial services industry. Muireann acted for Volkswagen on the global diesel emission investigations. Notably, she acted for Standard Bank (ICBC Standard Bank) in relation to the investigation commenced by the US Department of Justice and the UK’s Serious Fraud Office which culminated in the UK’s first deferred prosecution agreement negotiation and a stay of prosecution reached with the DOJ. Muireann previously held the position of head of investigations (EMEA) at the international investment bank Morgan Stanley in London. She was responsible for investigating all regulatory enquiries from Ireland, UK, Europe and Russia. She regularly represented Morgan Stanely in respect of enquiries by the Financial Conduct Authority.


  • Corporate and regulatory investigations

  • Financial services investigations and compliance

  • Anti-bribery and corruption

  • Commercial litigation and arbitration 

Representative Matters

  • Advised an Irish charity on an asset tracing matter. Successfully retrieved fraudulently transferred funds from Hong Kong following a cyber security breach.
  • Acted for an international bank on its financial crime and regulatory requirements following local acquisitions and establishment in Ireland.
  • Advised an international bank on the local ABC and regulatory obligations following significant growth in their Dublin presence.


Legal 500, 2021

'Recommended Lawyer' Muireann Dennehy brings “significant specialist international expertise to the team, with an impressive cv acting for large multi-nationals in complex cases.

Speaking Engagements & Teaching

Spoke at 2nd Annual Ireland Financial Crime Prevention Symposium.

Spoke at the 8th Annual London White Collar Crime Institution in association with the American Bar Association.

  • LinkedIn

Areas of Expertise

Dispute Resolution Investigations & White Collar Crime

Professional Memberships

Law Society of England and Wales (non-practising)

Bar of the State of New York (non-practising)

United Nations Justice Rapid Response

Civilian Expert, UK’s Stabilisation Unit

Women’s White Collar Defense Association

American Bar Association

European Criminal Bar Association

Fraud Advisory Panel

Fraud Lawyers Association


Columbia Law School, New York, LLM (Fulbright Scholar and Harlan Fiske Stone Scholar)

BPP Law School, London , LPC

Trinity College, Dublin, LLB (First Class Honours)