Tom O’Halloran is a Director based in Dublin and Teneo’s Forensic Technology Lead in Ireland. He is an eDiscovery and digital forensic specialist with over nine years of experience advising on complex litigation, arbitration, investigations, public inquiries, and regulatory matters across multiple sectors and jurisdictions.
Prior to joining Teneo, Tom led the Digital Forensics and eDiscovery practice at a multinational audit firm and previously served as Head of Forensics at a multinational alternative legal services provider. He has particular experience in large-scale and complex litigation, financial regulatory investigations, data subject access requests, data breach investigations, blockchain intelligence and investigations.
Tom regularly advises in-house legal and HR teams, senior counsel, regulatory bodies and law firms on complex disputes, investigations and regulatory matters. He frequently acts as a forensic expert in cases involving fraud, data theft, corporate espionage, employee misconduct, forgery, evidence tampering, intellectual property theft and blockchain-related disputes, supporting clients through all stages of the investigation process
Select Project Experience:
- Insurance litigation – Led the end-to-end eDiscovery strategy, including methodology design and review, for the largest litigation in Irish legal history, involving a claim exceeding $1 billion, more than 1,000 custodians, and a dataset of over 600 million documents.
- Public inquiry (Ireland) – Supported the Central Bank of Ireland in delivering the first fully paperless public inquiry in Ireland, implementing digital review workflows and infrastructure.
- Public Inquiry (Gibraltar) – Led the design and implementation of a Technology-Assisted Review approach for a large law firm, identifying over 10,000 relevant documents within a dataset of 4 million documents under accelerated timelines (3 weeks) in support of a public inquiry investigating allegations of misconduct by the former Police Commissioner.
- Cyber incident response (ransomware attack) – Acted as a first responder in the investigation of compromised systems following a major cyber incident. Led the identification of impacted data subjects and data classes across a significant volume of exfiltrated data and supported the deployment of AI-driven solutions to streamline personal and health data identification, enabling GDPR notification requirements to be met efficiently.
- Probate and crypto asset investigation – Led a forensic investigation into unauthorised access to devices belonging to a deceased individual, including the tracing and recovery strategy for misappropriated cryptocurrency assets using blockchain intelligence techniques.
- Forgery and evidence tampering – Conducted forensic analysis of document metadata and content to demonstrate invoice falsification in large-scale litigation, and performed audio authenticity analysis to establish that recordings had been manipulated and created across multiple devices.