Deborah Renner

O: (212) 484-9866 x119
[email protected]

"It’s not the size of the dog in the fight,
it’s the size of the fight in the dog."


Deborah Renner

Deborah is a seasoned class action attorney, specializing in consumer fraud, false advertising, data breach, privacy and securities class actions. Deborah began practicing class action law in 1996, defending insurance companies in consumer fraud class actions. From there, her practice expanded to include securities, privacy and false advertising class actions across a variety of industries and in courts around the country. Deborah also has represented amici in several U.S. Supreme Court cases on cutting-edge class action issues.

Deborah is a member of the American Law Institute and the American Bar Foundation, and previously taught class action law as an adjunct at Fordham University School of Law.




Represented Madoff Trustee against JPMorgan in connection with the bank’s role in Madoff’s Ponzi scheme, resulting in a $543 million settlement for the Trustee and class action plaintiffs and a $1.7 billion forfeiture to the U.S. Attorney’s Office.

Represented Madoff Trustee in numerous injunction proceedings, successfully curtailing class action litigation that interfered with the Trustee’s ability to collect assets for the estate. Most recently, argued and won Second Circuit appeal which affirmed injunction.

Won complete dismissal of data breach class action for major hospital.

Successfully represented major hospital in Civil Investigative Demand by state attorney general regarding data privacy and security practices.

Successfully represented broker-dealer in international securities-based class action.

Successfully represented preeminent magazine distributor in class action alleging false advertising under California law.

Represented 53 companies, including Fortune 500 companies, in an amicus brief before the U.S. Supreme Court in Gloucester Co. School Board v. Grimm, arguing in favor of the rights of transgender students.

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