Bio
Mr. O’Brien focuses his practice broadly on commercial matters, municipal matters, and general litigation. Mr. O’Brien devotes a substantial amount of time defending creditors against individual and class claims that the creditors have violated the Fair Debt Collection Practices Act and the Telephone Consumer Protection Act. Additionally, Mr. O’Brien’s practice extends to white collar criminal defense, regulatory enforcement matters, internal investigations, and complex civil and securities litigation. Prior to joining the firm, Mr. O'Brien worked as an Assistant Corporation Counsel for the New York City Law Department.
Articles & Publications
- Co-author, "Eleventh Circuit Rules that a Debt Collector's Use of a Third-party Vendor Violates the FDCPA," April 21, 2021
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Press Releases
Lippes Mathias Partner Sean M. O’Brien Receives Pro Bono Award from U.S. District Court for the Western District of New York
December 9, 2025
In The news
Sean M. O’Brien's Pro Bono Role in Niagara County Jail Kosher Diet Lawsuit Detailed in The Buffalo News
November 13, 2025
Press Releases
64 Lippes Mathias Attorneys Recognized in the 2024 Editions of Upstate New York and Florida Super Lawyers
August 22, 2024
Press Releases
Upstate New York Super Lawyers 2023 Honors 45 Lippes Mathias Attorneys
August 29, 2023
Press Releases
69 Lippes Mathias Attorneys Recognized in the 2024 Edition of "The Best Lawyers in America©"
August 17, 2023
Press Releases
Sean M. O’Brien Elected to the Erie County Bar Association Volunteer Lawyers Project Board of Directors
June 28, 2023
Press Releases
Lippes Mathias Elevates Three Attorneys to Partner
January 9, 2023
Press Releases
2022 Upstate New York Super Lawyers Recognizes 48 Attorneys from Lippes Mathias
August 23, 2022