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Eoin P. Beirne

Member / Co-chair, White Collar Defense and Government Investigations Practice

[email protected]

+1.617.348.1707

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Eóin is a nationally recognized trial lawyer and career defense lawyer who represents companies, executives, public officials, and board committees in their most sensitive government investigations and high-stakes criminal and civil enforcement matters. Co-chair of Mintz’s White Collar Defense and Government Investigations Practice, Eóin is known for achieving quiet, early-stage resolutions with the DOJ, SEC, state attorneys general, and other enforcement agencies — and for winning when cases must be tried.

Eóin has secured acquittals, dismissals, and declinations in complex cases involving allegations of securities fraud, health care fraud, government contracting fraud, public corruption, insider trading, FCPA violations, and False Claims Act liability. He regularly advises corporate boards and special committees on internal investigations, whistleblower allegations, and crisis-driven compliance matters, and has deep experience guiding clients through parallel criminal, civil, and regulatory inquiries. Eóin’s investigations have helped clients avoid government charges and reputational damage, negotiate favorable resolutions, and get back to business.

When a negotiated resolution is not possible, Eóin is a veteran courtroom advocate who served as trial counsel in the only full trial acquittal obtained in the nationwide “Varsity Blues” prosecution. Recognized by Chambers USA and named a Litigation Trailblazer by the National Law Journal, he has represented clients in some of the largest and highest-visibility investigations in recent years, including matters involving the DOJ Special Counsel, the global 1MDB investigation, federal cybercrime inquiries, NTSB investigations, and postincident infrastructure failures.

In addition to his work for clients, Eoin serves a faculty member of the Trial Advocacy program at Harvard Law School.

Eóin is a nationally recognized trial lawyer and career defense lawyer who represents companies, executives, public officials, and board committees in their most sensitive government investigations and high-stakes criminal and civil enforcement matters. Co-chair of Mintz’s White Collar Defense and Government Investigations Practice, Eóin is known for achieving quiet, early-stage resolutions with the DOJ, SEC, state attorneys general, and other enforcement agencies — and for winning when cases must be tried.

Experience

Representative Matters

  • Led defense team securing the lone trial acquittal of a charged parent in the “Varsity Blues” federal admissions cases.
  • Obtained declination for a top executive in the multibillion-dollar global 1MDB investigation after strategic advocacy to DOJ.
  • Represented individual recorded on a wire by a cooperating witness in high-profile insider trading conspiracy case involving Fortune 100 companies; no charges were brought following presentation to the DOJ.
  • Avoided all charges for a federal defense contractor following voluntary self-disclosure of potential FCA and criminal issues.
  • Represented multiple individuals and entities in DOJ Special Counsel’s post-2020 election investigations with no charges brought.
  • Successfully defended a large ophthalmology practice that provided trans-cranial doppler ultrasounds (TCDs) in alleged kickback investigation, resulting in no charges being brought.
  • Convinced DOJ not to charge medical practices, laboratories, and government contractors in numerous FCA, Anti-Kickback, and fraud matters.
  • Trial counsel in a high-profile criminal fraud trial in the Southern District of New York.
  • Achieved complete trial dismissal of federal wire and mail fraud charges against an individual in a large-scale fraud case in the District of Massachusetts.
  • Represented corporations and executives in SEC and DOJ insider trading investigations, securing declinations.
  • Guided a public utility contractor through NTSB and federal grand jury investigations arising from the Merrimack Valley explosions — with no charges filed.
  • Conducted numerous board-level internal investigations following whistleblower complaints, CIDs, subpoenas, and cyber incidents.
  • Represented national and locally elected officials in Congressional and grand jury investigations.
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viewpoints

On July 31, 2025, the United States Department of Justice (DOJ) announced a pair of settlements with companies accused of having violated the False Claims Act (FCA) by falsely representing their compliance with certain cybersecurity requirements applicable to federal contractors. These two settlements highlight key aspects of DOJ’s enforcement priorities: (1) DOJ’s strong focus on enforcing the FCA in the cybersecurity space, and (2) DOJ’s willingness to reward companies that self-disclose violations. All government contractors certifying compliance with regulatory and contractual requirements must stay vigilant and take the steps needed to comply. 

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On June 23, 2025, the United States Court of Appeals for the Ninth Circuit affirmed a district court judgment in a case in which the jury found the defendant knowingly made false statements on customs forms to avoid paying duties on Chinese imports. The decision affirms an expansive application of the False Claims Act (“FCA”) that plays directly into the hands of the Trump administration’s evolving enforcement priorities.

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This in-depth webinar examines DOJ’s enforcement priorities and topics such as recent False Claims Act settlements (which go beyond health care fraud), enforcement risks and best practices, and whistleblower risks and protections from an employment law perspective.

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The first 120 days of the Trump administration have been characterized by dramatic changes in the realm of white-collar enforcement. Recently issued memoranda and policy guidance from DOJ contains critical details regarding the new administration’s enforcement priorities.  

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Our 2025 edition of EnforceMintz reflects on health care enforcement trends, predicts how health care enforcement may evolve, and offers practical guidance about what these trends and predictions mean for health care providers, payors, and other stakeholders.

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As opioid-related enforcement efforts continued across the opioid supply chain in 2024, the government pursued criminal charges in two matters that resulted in significant settlements. Additionally, a number of recent cases against pharmacies involve a common theory of liability based on the Controlled Substances Act, which served as the basis for civil liability under the False Claims Act.

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Over the past two years, the Department of Justice has actively incentivized companies to voluntarily self-disclose potential civil and criminal violations. This article explores the DOJ’s new policies, the benefits of self-disclosure, and the challenges companies face in complying with these initiatives.

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The United States Attorney’s Office for the District of Massachusetts recently unsealed what it described as the “first-ever criminal charges against financial services firms for market manipulation and ‘wash trading’ in the cryptocurrency industry.” 

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Read about DOJ recent scrutiny of private equity deals, its initiatives aimed at increasing acquirer oversight of M&A transactions, and best practices for private equity sponsors in the current enforcement landscape.

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In March 2024, at the American Bar Association’s 39th National Institute on White Collar Crime, Deputy Attorney General (“DAG”) Lisa Monaco announced that the Department of Justice (“DOJ” or the “Department”) intended to create a new whistleblower rewards pilot program.

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News & Press

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podcasts

In this episode, Health Care Enforcement Defense specialists Eoin Beirne, Karen Lovitch, and Brian Dunphy discuss key regulatory and policy updates issued by the DOJ and their potential impact on False Claims Act cases, from self-disclosure to privacy regulations.

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Podcast Viewpoint Image

Bridgette Keller speaks with Karen Lovitch, Brian Dunphy, and Eoin Beirne about the Mintz Health Care Enforcement Defense Practice’s recent edition of the EnforceMintz newsletter, Analyzing Health Care False Claims Act Cases, and key health care enforcement trends.

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Eóin is a nationally recognized trial lawyer and career defense lawyer who represents companies, executives, public officials, and board committees in their most sensitive government investigations and high-stakes criminal and civil enforcement matters. Co-chair of Mintz’s White Collar Defense and Government Investigations Practice, Eóin is known for achieving quiet, early-stage resolutions with the DOJ, SEC, state attorneys general, and other enforcement agencies — and for winning when cases must be tried.

Recognition & Awards

  • Chambers USA: Massachusetts – Litigation: White Collar Crime and Government Investigations (2022 – 2026)

  • Lawdragon: 500 Leading Litigators in America (2022 – 2027)

  • Lawdragon: 500 Leading Global Investigations Lawyers (2026)

  • Best Lawyers in America: Criminal Defense: White Collar (2021 – 2027)

  • National Law Journal: 2022 Litigation Trailblazer

  • Fellow, Litigation Counsel of America, The Trial Lawyer Honorary Society

  • Massachusetts Super Lawyers: Criminal Defense: White Collar (2017 – 2025)

  • Boston Magazine: Top Lawyers – Criminal Defense: White Collar (2021 – 2022, 2025)

  • Legal 500: Recommended Lawyer – Corporate Investigations and White-Collar Criminal Defense (2026)

  • Mondaq: Thought Leadership Award Winner, Autumn 2025

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Eóin is a nationally recognized trial lawyer and career defense lawyer who represents companies, executives, public officials, and board committees in their most sensitive government investigations and high-stakes criminal and civil enforcement matters. Co-chair of Mintz’s White Collar Defense and Government Investigations Practice, Eóin is known for achieving quiet, early-stage resolutions with the DOJ, SEC, state attorneys general, and other enforcement agencies — and for winning when cases must be tried.

Involvement

  • Member, Boston Bar Association
  • Member, Federal Bar Association
  • Past Board Member, Massachusetts Association of Criminal Defense Lawyers (MACDL)
  • Past Member, American Bar Association’s Public Corruption and Extortion Subcommittee and the Criminal E-Discovery Taskforce
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Eoin P. Beirne

Member / Co-chair, White Collar Defense and Government Investigations Practice

Boston