Eoin P. Beirne
Member / Co-chair, White Collar Defense and Government Investigations Practice
+1.617.348.1707
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.
viewpoints
DOJ Fraud and Health Care Enforcement: Latest Priorities, Trends, and Compliance Considerations
July 31, 2026 | Webinar | By Karen Lovitch , Eoin Beirne, Samantha Kingsbury, Nick A. LaPalme
Watch Mintz's on-demand webinar on DOJ health care fraud and False Claims Act enforcement priorities, emerging risk areas, whistleblower trends, and compliance strategies for 2026.
The Boston Insider Trading Prosecutions: Case Architecture and Defense Themes
May 13, 2026 | Alert | By Eoin Beirne, Edmund P. Daley, Cory S. Flashner, Natashia Tidwell
Federal prosecutors in Boston and the SEC unveiled a coordinated takedown of an alleged global insider‑trading ring spanning multiple years, law firms, and “hub‑and‑spoke” tipping chains. As of May 6, 2026, authorities said 30 individuals have been charged.
DOJ Creates National Fraud Enforcement Division: What Actually Will Change—and What Remains to Be Seen
April 9, 2026 | Blog | By Eoin Beirne
An analysis of DOJ’s newly announced National Fraud Enforcement Division assesses what changes immediately, what remains uncertain, and how companies should prepare for a more centralized and aggressive fraud enforcement landscape.
DOJ Issues First-Ever Department-Wide Corporate Enforcement Policy: What Companies Need to Know
March 11, 2026 | Blog | By Eoin Beirne, Nick A. LaPalme
Overview of DOJ’s new Department-wide Corporate Enforcement Policy, explaining uniform self-disclosure standards, declination incentives, whistleblower risks, and the need for swift action.
Anatomy of a Multi-National Insider Trading Case: United States v. Khouadja et al.
March 2, 2026 | Blog | By Eoin Beirne, Edmund P. Daley
A breakdown of urgent steps for anyone tied to the Khouadja insider‑trading case—secure counsel, preserve evidence, and move fast.
Iceberg Ahead! Top Massachusetts Federal Prosecutor Sounds the Alarm on the “Tip of the Iceberg” of PPP Fraud Prosecutions
February 13, 2026 | Blog | By Edmund P. Daley, Eoin Beirne, Nick A. LaPalme
DOJ and the U.S. Attorney’s Office for Massachusetts signal aggressive PPP and government program fraud enforcement. What can companies and decisionmakers do now.
DOJ Criminal Fraud Section 2025 Year in Review – Health Care Fraud Is Front and Center
February 6, 2026 | Blog | By Karen Lovitch , Eoin Beirne, Nick A. LaPalme
On January 22, 2026, the Department of Justice (DOJ or the Department) Criminal Fraud Section issued its 2025 Year in Review summary (YIR Summary). Our more detailed analysis of the full YIR Summary can be found here. DOJ’s Health Care Fraud Unit (the HCF Unit) is focused on “prosecuting complex health care fraud matters and cases involving the illegal prescription, distribution, and diversion of controlled substances.” To carry out its mission, in 2025, the HCF Unit operated 8 Health Care Fraud Strike Forces in 26 federal judicial districts across the nation. The HCF Unit’s reported average return on investment is $106.76 per $1 spent.
DOJ Criminal Fraud Section 2025 Year in Review: Major Reorganization Confirms Shifting Enforcement Landscape
January 30, 2026 | Blog | By Eoin Beirne, Nick A. LaPalme
The Department of Justice's (DOJ or the Department) Criminal Fraud Section has undergone its most significant reorganization in years, according to its recently released 2025 Year in Review. Those changes and the current climate of enforcement uncertainty require more vigilance, not less, from corporate compliance and law departments.
Streamlined DOJ Resolutions: Declinations, NPAs, and DPAs Explained — EnforceMintz
January 20, 2026 | Article | By Eoin Beirne, Nick A. LaPalme
Learn how DOJ’s expanded Voluntary Self-Disclosure policy and evolving use of NPAs and DPAs create new opportunities for health care companies to resolve enforcement actions. Explore strategies for cooperation, remediation, and compliance.
News & Press
FCA Bar Eager to Scrutinize 11th Circ. Qui Tam Debate
December 9, 2025|
Now 'Back to Stability,' Mass. US Atty Office Set to Ramp Up
November 15, 2024|
Private Equity: How to Stay Out of the DOJ’s Cross-Hairs
October 10, 2024|
4 Years On, Unraveling The Lessons Of 'Varsity Blues'
September 27, 2023|
Thirteen Mintz Members Named To Lawdragon 500 Leading Litigators List
September 11, 2023|
Fencers' Creds Foiled Harvard Bribe Case, Attys Say
December 22, 2022|
Twenty-Eight Mintz Attorneys Named To Boston Magazine’s Top Lawyers List
November 22, 2022|
The Government’s Long Game for Investigating COVID-19 Relief Fraud
November 11, 2022|
Why A 76-Year-Old Top Court Case Could Undo 'Varsity Blues'
November 10, 2022|
New Mass. AG Campbell Inherits 'Bold' Litigation Mandate
November 9, 2022|
2019 Trends In DOJ Health Care Enforcement
January 13, 2020|
2017 Health Care Enforcement Review: Final Thoughts
January 19, 2018|
Mintz Elevates Eight Attorneys to Members of the Firm
May 13, 2014|
podcasts
Health Law Diagnosed – EnforceMintz – Part 2: DOJ Regulatory and Policy Update
April 25, 2023 | Podcast | By Bridgette Keller, Eoin Beirne, Karen Lovitch , Brian Dunphy
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.
Health Law Diagnosed – EnforceMintz: Analyzing Health Care False Claims Act Cases
April 18, 2023 | Podcast | By Bridgette Keller, Karen Lovitch , Brian Dunphy, Eoin Beirne
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.
Events & Speaking
DOJ Fraud and Health Care Enforcement: Latest Priorities, Trends, and Compliance Considerations
Virtual Event
Publications
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
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
Recent Insights
