Bio
Sean O’Brien is a trial and appellate litigator whose practice spans state and federal courts across the country.
As a member of the Consumer Financial Services Litigation Practice Team, Sean defends members of the financial services industry and advises consumer-facing businesses in complex individual and class action claims brought pursuant to the Fair Debt Collection Practices Act, Fair Credit Reporting Act, Telephone Consumer Protection Act, and other consumer-oriented statutes. Sean also provides guidance to clients in developing compliance protocols that reflect state and federal mandates, in addition to navigating regulatory enforcement actions.
As a member of the Business and Commercial Litigation Practice Team, Sean handles a variety of commercial litigation matters, including breach of contract claims, commercial torts, corporate governance and shareholder litigation, and bankruptcy-related litigation. Sean provides guidance to clients facing complex legal challenges and is adept at resolving matters quickly and efficiently. Sean also works closely with the Sports, Entertainment and Hospitality Industry and Cannabis Practices, helping to advise clients embroiled in disputes that have, or could potentially, lead to litigation.
Sean serves on the Firm’s Pro Bono Advisory Committee and is a member of the Western District of New York’s Pro Bono Program.
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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115 Lippes Mathias Attorneys Recognized in the 2027 Edition of The Best Lawyers in America®
August 21, 2026
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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
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Upstate New York Super Lawyers 2023 Honors 45 Lippes Mathias Attorneys
August 29, 2023
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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