Brien O’connor

Ropes & Gray LLP

Brien O’Connor is an accomplished trial lawyer who has also negotiated some of the most significant corporate criminal and civil resolutions in the country. Widely recognized as one of the nation’s leading white collar defense lawyers, Brien has been characterized by Chambers USA as “a hugely experienced and well-respected litigator who delivers both quality service and quality result.”

Brien focuses his practice on representing corporations and individuals in government investigations and litigation, including civil False Claims Act cases. He regularly counsels clients on matters involving alleged health care fraud and abuse, securities fraud, tax crimes, export law violations, and other fraud and corruption.

He has successfully litigated numerous civil and criminal cases, including multi-district civil litigation and False Claims Act cases. Brien also conducts internal investigations and compliance reviews for corporate clients.

A former Assistant U.S. Attorney for the District of Massachusetts and Chief of that office’s Public Corruption and Special Prosecutions Unit, Brien spent 10 years investigating and prosecuting cases involving complex securities, health care, insurance, tax and bank fraud; drug trafficking, money laundering and RICO violations; and public corruption and other federal crimes. Brien has successfully tried numerous cases to juries and successfully handled several federal appeals.

Brien has been a member of the firm’s Policy Committee since 2013 and is former co-head of the firm’s Government Enforcement practice group.


  • JD, cum laude, University of Pennsylvania Law School, 1985
  • BA, magna cum laude, Yale University, 1981


  • Massachusetts, 1985
  • U.S. Court of Appeals for the First Circuit
  • U.S. Court of Appeals for the Eleventh Circuit
  • U.S. District Court for the District of Massachusetts

CLERKSHIPS : Chief Judge Andrew A. Caffrey, U.S. District Court for the District of Massachusetts (1985 – 1986)


  • American Bar Association
  • American Bar Association White Collar Crime Section, Northeast Region Co-Chair
  • Boston Bar Association
  • Boston Bar Association White Collar Crime Section


Rate : $$$

What types of cases Attorney Brien O'connor & Ropes & Gray LLP can handle?
Ropes & Gray LLP can handle cases related to laws concerning Tax, Litigation, Insurance, White Collar Crime, Government, Securities Fraud. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Ropes & Gray LLP located?
Ropes & Gray LLP is located at Prudential Tower, 800 Boylston St, Boston, MA 02199, USA. You can reach out to Ropes & Gray LLP using their phone line 617.951.7385. You can also check their website or email them at Brien.O'[email protected].
How much would it cost to hire Ropes & Gray LLP?
Brien O'connor lawyer charges are specific to each case. However, they work with contingency fees and its ranges from $$ to $$$. They also provide free consultation [and no obligation quotes] if you are interested to hire.
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