Deborah H. Renner


New York
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F +1.212.589.4201


Deborah Renner leads BakerHostetler's class action practice in New York and is a founder and former editor of BakerHostetler's Class Action Lawsuit Defense blog. She also serves as the pro bono coordinator for the New York office and is on the firm's Diversity Committee.

Deborah focuses her practice on complex commercial litigation, including the defense of consumer fraud, data breach, insurance, Employee Retirement Income Security Act (ERISA) and securities class actions. Deborah has successfully defended numerous companies in nationwide, multidistrict and state class actions. She has defeated class certification in courts around the country and has won the dismissal of class claims at the outset of numerous actions. Deborah frequently advises companies on class action defense and regulatory inquiries. She has represented companies facing regulatory inquiries in the data privacy, insurance and securities arenas. Among her areas of knowledge and experience, Deborah is certified in information privacy. She was recently elected to the American Law Institute and the American Bar Foundation. 

Select Experience

  • Representing a New York-based real estate holding company in a putative class action alleging fraud by building owners with respect to New York's rent stabilization laws. 
  • Representing company in a putative class action under the Telephone Consumer Protection Act.
  • Recently represented a retailer in a threatened class action under New Jersey's Truth-in-Consumer Contract, Warranty and Notice Act, obtaining favorable settlement.
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  • Representing a company in a putative class action under the Telephone Consumer Protection Act (TCPA).
  • Represented a retailer in a threatened class action under New Jersey's Truth-in-Consumer Contract, Warranty and Notice Act, obtaining a favorable settlement.
  • Represented a company in a Civil Investigative Demand by a state attorney general regarding data privacy and security practices.
  • Won complete dismissal of a data breach class action. Polanco v. Omnicell, Inc., 988 F. Supp. 2d 451 (D.N.J. 2013).
  • Represented a broker-dealer in an international securities-based class action that settled favorably for the client. Marylebone PCC Limited v. Millennium Global Investments, Ltd., No. 12-cv-3835, slip order (S.D.N.Y. July 7, 2014). 
  • Obtained or enforced an injunction to stop class litigation: 
    • Marshall v. Capital Growth Co., 2017 WL 921963 (Bankr. S.D.N.Y. March 7, 2017).
    • Picard v. Goldman, 546 B.R. 284 (Bankr. S.D.N.Y. 2016), aff’d, 2017 WL 383490 (S.D.N.Y. Jan. 24, 2017).
    • Picard v. Marshall, 511  B.R. 375 (Bankr. S.D.N.Y. June 23, 2014), aff’d, Fox v. Picard, 531 B.R. 345 (S.D.N.Y. May 11, 2015).
    • Picard v. Fox, 429 B.R. 423 (Bankr. S.D.N.Y. 2010), aff'd, In re Madoff, 848 F. Supp. 2d 469 (S.D.N.Y. 2012), aff'd, 740 F.3d 81 (2d Cir. 2014).
    • Picard v. Stahl, 443 B.R. 295 (Bankr. S.D.N.Y. 2011), aff'd, In re Bernard L. Madoff Inv. Sec. LLC, 2011 WL 7981599 (S.D.N.Y. Dec. 5, 2011), aff'd, The Lautenberg Found. v. Picard, 512 Fed. Appx. 18 (2d Cir. 2013).
    • In re Bernard L. Madoff, 477 B.R. 351 (Bankr. S.D.N.Y. 2012), aff'd, 2013 WL 5511027 (S.D.N.Y. Sept. 30, 2013).
    • Picard v. Maxam Absolute Return Fund, L.P., 460 B.R. 106 (Bankr. S.D.N.Y. 2011), aff'd, 474 B.R. 76 (S.D.N.Y. 2012).
  • Represented amicus in U.S. Supreme Court in Campbell-Ewald Company v. Gomez, 136 S. Ct. 663 (Jan. 20, 2016), concerning the use of an offer of judgment in a TCPA case.
  • Represented amicus in U.S. Supreme Court in Tyson Foods, Inc. v. Bouaphakeo, 2016 WL 1092414 (March 22, 2016), dealing with the use of statistics for determining liability and damages and the inclusion of uninjured class members in a class action under Rule 23 or a collective action under the Fair Labor Standards Act.
  • Represented amicus in U.S. Supreme Court in The Standard Fire Ins. Co. v. Knowles, 133 S. Ct. 1345 (2013), holding that named plaintiff's counsel could not use stipulation to avoid federal jurisdiction. 
  • Represented amicus in U.S. Supreme Court in Comcast Corp. v. Behrend, 133 S. Ct. 1426 (2013), holding that named plaintiffs could not rely on a class-wide damages model to obtain class certification.
  • As a lead attorney on the BakerHostetler team serving as counsel to Irving H. Picard, the Securities Investor Protection Act (SIPA) Trustee for the liquidation of Bernard L. Madoff Investment Securities LLC, managed a team of attorneys in Picard v. JPMorgan, which, in 2014, resulted in two settlements totaling $543 million for the SIPA Trustee and class action plaintiffs, and which led to a $1.7 billion forfeiture to the United States Attorney's Office. 
  • Won summary judgment in a putative class action concerning alleged fraud in the pricing of long-term care insurance in an ERISA context. Rakes v. Life Investors Ins. Co. of America, 622 F. Supp. 2d 755 (N.D. Iowa June 20, 2008), aff'd, 582 F.3d 886 (8th Cir. Sept. 18, 2009).
  • Won the complete dismissal of a securities fraud class action alleging violations of Sections 10(b) and 20(a) of the Securities and Exchange Act of 1934. Medis Investor Group v. Medis Technologies, Ltd., 586 F. Supp. 2d 136 (S.D.N.Y. 2008), aff'd, 2009 WL 2171277 (2d Cir. July 21, 2009).

Recognitions and Memberships


  • New York Metro "Super Lawyer" (2011 to 2016)
    • "Top 50 Women in New York" (2014 to 2015)


  • American Law Institute
    • Principles of the Law, Data Privacy: Members Consultative Group
    • Restatement Third, Conflict of Laws: Members Consultative Group
  • American Bar Foundation: Member
  • American Bar Association, Section of Litigation Class Action and Derivative Suits 
  • International Association of Privacy Professionals
    • Certified Information Privacy Professional (U.S.)
  • Brooklyn Bar Association, Volunteer Lawyers Project: Advisory Board
  • Defense Research Institute, Appellate Advocacy Section



Pro Bono

  • Represented 53 companies in an amicus brief before the U.S. Supreme Court in Gloucester Co. School Bd. v. Grimm, arguing in favor of the rights of transgender students.
  • Frequently works with Immigration Equality, helping gay, lesbian, transgender and HIV-positive individuals gain asylum in the United States.

Featured Video

Deborah Renner comments on Amgen vs. Connecticut Retirement Plans and Trust Funds
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Prior Positions

  • Fordham University Law School: Adjunct Assistant Professor of Class Action Law (2002 to 2006)


  • U.S. Supreme Court, 1997
  • U.S. Court of Appeals, Second Circuit, 2008
  • U.S. Court of Appeals, Third Circuit, 2001
  • U.S. Court of Appeals, Eighth Circuit, 2008
  • U.S. District Court, Southern District of New York, 1993
  • U.S. District Court, Eastern District of New York, 1993
  • U.S. District Court, Northern District of New York, 2003
  • New York, 1993
  • District of Columbia, 1994
  • New Jersey, 2014


  • J.D., Harvard Law School, 1992, cum laude
  • M.A., Princeton University, 1987
  • B.A., Johns Hopkins University, 1984, with honors


In The Blogs

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Class Action Lawsuit Defense
Will the Supreme Court Address the Growing Uncertainty in Class Certification Injury Standards?
May 18, 2017
Recent years have seen some upheaval in the lower courts on whether classes may be certified when they include members who lack actual injury. So far, however, the Supreme Court has declined to address this issue, thus increasing...
Class Action Lawsuit Defense
Substantial Risk of Harm in Data Breach Class Actions Ripe for Supreme Court Review
May 16, 2017
Early in May, the U.S. Court of Appeals for the Second Circuit in Whalen v. Michaels Stores, Inc., No. 16-260 (L) (2d Cir. May 2, 2017), affirmed the dismissal of a data breach class action brought against Michaels Stores Inc. (Michaels)...
Class Action Lawsuit Defense
Ninth Circuit Dismisses Consumer Claims Challenging Scientific Substantiation
April 27, 2017
On April 21, 2017, the Ninth Circuit affirmed the dismissal of two putative class actions filed against manufacturers of human growth hormone (HGH) supplements. In agreeing with the Northern District of California, the Ninth Circuit ruled...
Class Action Lawsuit Defense
Game On: Supreme Court to Decide Whether Xbox Plaintiffs Can Create Appellate Review
April 10, 2017
Recently, the United States Supreme Court heard argument in Microsoft Corp. v. Baker,[1] a case that may significantly impact class-action defense and appellate jurisdiction. Plaintiff classes frequently want to immediately appeal orders...
Class Action Lawsuit Defense
D.C. Circuit May Have Finally Killed TCPA Class Actions Over Solicited Faxes Without Opt-Out Notices!
April 3, 2017
On Friday, in a split decision, the United States Court of Appeals for the District of Columbia Circuit entered its long-awaited ruling in Yaakov v. Federal Communications Commission, holding that “the FCC’s 2006 Solicited Fax Rule is []...