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Eric O'Neill

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Eric O’Neill is a practicing attorney who specializes in cyber security vulnerability assessments, counterintelligence and counterterrorism operations, investigations into economic espionage, internal investigations and security risk assessment consulting.


Mr. O’Neill served as an operative for the F.B.I., where he conducted national security field operations against terrorists and foreign intelligence agents. His role in the investigation and capture of the most notorious spy in United States history, Robert Phillip Hanssen, became the subject of Universal Studio’s movie Breach, released to critical acclaim in 2007. O'Neill tells the story of catching Hanssen in Gray Day: My Undercover Mission to Expose America's First Cyber Spy (Crown) a book that Publisher’s Weekly called “an adrenaline-laced memoir” and “as compulsively readable as any thriller.” His upcoming book, The Invisible Threat (Harper Collins 2025), will show readers how to take up arms in the current cyber war.


Mr. O’Neill has broad legal experience in the areas of homeland security, border protection, risk and liability mitigation for anti-terrorism technologies, national security related matters and federal investigations of United States citizens and foreign nationals.


Mr. O’Neill has provided counsel and litigation services on a range of legal and investigative matters, including due diligence for mergers and acquisitions, procurement fraud, internal investigations of companies and employee corruption cases. Mr. O’Neill is an accomplished public speaker who lectures internationally about security issues.


+1 202.656.9950

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