Deborah Renner

O: (646) 651-4808
[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 nationally-recognized class action attorney, specializing in consumer fraud, false advertising, data breach, privacy and securities class actions. She previously led the class action practice for the New York office of an AmLaw 100 firm.

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. In addition to her class action practice, Deborah represented the Trustee in the Bernard L. Madoff liquidation proceedings for nearly a decade. Deborah assumed the lead in suing financial institutions on behalf of the Trustee, most notably obtaining a multi-billion settlement against JPMorgan. She also made precedent-setting law, enjoining litigants who sought to sue third parties who had settled with the Trustee.

Deborah has been active in pro bono and diversity efforts for nearly her entire career, heading the pro bono practice for the New York office of her previous firm, and serving on the diversity committees of both her previous law firms. She has been a strong proponent of LGBTQ rights, most recently representing Fortune 500 and other companies arguing in favor of transgender rights before the U.S. Supeme Court. Deborah is a member of the Advisory Board of the Volunteer Lawyers Project of the Brooklyn Bar Association.

Deborah is a cum laude graduate of Harvard Law School. She has been named a “Super Lawyer” in class actions every year beginning in 2011, and was named a top 50 Women Super Lawyer in 2014-15. Deborah is a member of the American Law Institute, proudly serving on its Conflict of Laws and Data Privacy consultative groups, and is a member of the prestigious American Bar Foundation. Deborah previously taught class action law as an adjunct assistant professor at Fordham University School of Law, and she frequently lectures and authors papers on developments in class action 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.

New York
20 West 23rd Street, Fifth Floor, New York, NY 10010