Brien T. O'Connor

Brien T. O'Connor


Ropes & Gray LLP

Recognized since 2009

Boston, Massachusetts

Practice Areas

Bet-the-Company Litigation

Biotechnology and Life Sciences Practice

Commercial Litigation

Criminal Defense: White-Collar

Litigation - Regulatory Enforcement (SEC, Telecom, Energy)

Lawyer of the Year Badge - 2025 - Litigation - Regulatory Enforcement (SEC, Telecom, Energy)
Navigate to map location for Brien T. O'Connor
Lawyer of the Year Badge - 2025 - Litigation - Regulatory Enforcement (SEC, Telecom, Energy) Lawyer of the Year Badge - 2022 - Litigation - Regulatory Enforcement (SEC, Telecom, Energy) Lawyer of the Year Badge - 2021 - Biotechnology and Life Sciences Practice Lawyer of the Year Badge - 2017 - Biotechnology and Life Sciences Practice Lawyer of the Year Badge - 2015 - Bet-the-Company Litigation
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Location
  • Prudential Tower
    800 Boylston Street
    Boston, MA 02199-3600
Education
  • University of Pennsylvania, J.D., graduated 1985

Ropes & Gray LLP
Headquarters: Boston, Massachusetts

116 The Best Lawyers in America® awards

95 Best Lawyers: Ones to Watch® in America awards

Best Law Firms Badge Visit Website View Firm Profile

Lawyer of the Year Badge - 2025 - Litigation - Regulatory Enforcement (SEC, Telecom, Energy) Lawyer of the Year Badge - 2022 - Litigation - Regulatory Enforcement (SEC, Telecom, Energy) Lawyer of the Year Badge - 2021 - Biotechnology and Life Sciences Practice Lawyer of the Year Badge - 2017 - Biotechnology and Life Sciences Practice Lawyer of the Year Badge - 2015 - Bet-the-Company Litigation
Named "Lawyer of the Year" by Best Lawyers® for:
  • Litigation - Regulatory Enforcement (SEC, Telecom, Energy), Boston (2025)
  • Litigation - Regulatory Enforcement (SEC, Telecom, Energy), Boston (2022)
  • Biotechnology and Life Sciences Practice, Boston (2021)
  • Biotechnology and Life Sciences Practice, Boston (2017)
  • Bet-the-Company Litigation, Boston (2015)
Recognized in The Best Lawyers in America® 2025 for work in:
  • Bet-the-Company Litigation
  • Biotechnology and Life Sciences Practice
  • Commercial Litigation
  • Criminal Defense: White-Collar
  • Litigation - Regulatory Enforcement (SEC, Telecom, Energy)
Special Focus:
  • COVID-19
Additional Areas of Practice:
  • Qui Tam Law

Publications

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