"U.S. Trial Firm of the Year" – 3 Consecutive Years (Benchmark; Law360)
Mariah Rivera Portrait

Mariah
Rivera

Counsel

Counsel

Education

Clerkships

  • Hon. Nelson S. Román, U.S. District Court for the Southern District of New York

Admissions

  • New York

Mariah Rivera focuses her practice on high-stakes business disputes, complex litigation, and white collar investigations.

Prior to joining Hueston Hennigan, Ms. Rivera was an associate at Paul, Weiss, Rifkind, Wharton & Garrison, where she represented clients in a wide variety of matters, including climate change litigation, government investigations, and complex commercial disputes.

During law school, Ms. Rivera served as a general editor of the Cornell Law Review.

Experience

Secured a complete defense arbitration award after a two-week trial for the country’s largest integrated health care system against claims that it improperly withheld tens of millions of dollars in payments from a hospital system. The arbitrator rejected the hospitals’ breach of contract, breach of implied covenant, declaratory judgment, and California unfair competition claims by adopting our arguments that the health care system’s line-item denials were within the scope of its broad contractual rights to review and audit the hospitals’ billed claims before payment.

Representing the major record labels, including UMG Recordings, Warner Music Group and Sony Music Entertainment, in high-profile, high-stakes copyright litigation against two leading generative AI music companies, Suno and Udio. The lawsuits are the first time the record labels have sued AI companies over sound recording copyrights (see “AI Cos. Hit With Copyright Claims From Music Labels,” Law360; “Major record labels sue AI company behind ‘BBL Drizzy,’” The Verge; “Music Labels Take On AI Startups With New Lawsuits,” The Wall Street Journal; “AI’s Most Ambitious Music Generators Accused of ‘Massive’ Infringement In New Lawsuit,” Rolling Stone).

Representing AbbVie, a defendant in the multibillion-dollar Allergan textured breast implant litigation, which involves approximately 1,700 individual lawsuits and a nationwide class action in four venues including multidistrict litigation in the District of New Jersey. The plaintiffs contend AbbVie’s BIOCELL® textured breast implants cause a rare type of cancer, and they argue AbbVie is liable under manufacturing defect, failure to warn, and misrepresentation theories.

Successfully reached a settlement on behalf of a portfolio company in a breach of contract lawsuit against a major alcohol beverage company.

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Obtained a favorable settlement for CoreLogic Credco, LLC in a consumer class action lawsuit alleging violations of federal and state credit reporting laws.

Representing Shopify Inc. in multiple class action lawsuits arising out of a data breach.

Represented an oil and gas company in connection with a lawsuit brought by the New York Attorney General’s Office.

Represented several creditors in a lawsuit against a state oil company that defaulted on its debt payments.

Represented a financial institution in a lawsuit and settlement negotiations related to the 2008 financial crisis.

Represented the families of certain victims of the Sandy Hook Elementary School shooting in a nationally covered litigation against Remington Arms Co. LLC.

Recognitions

  • Best Lawyers: Ones to Watch in America (2026)