Jennifer Rosa serves as co-lead of Mayer Brown's New York Litigation & Dispute Resolution practice. Her practice focuses on representing financial institutions, pharmaceutical companies, and other multinational corporations in complex commercial and securities litigation in federal and state courts. Her experience also includes representing clients in government agency proceedings and internal investigations. Jenn concentrates on the areas of banking and financial services, including actions involving alleged violations of the securities laws and antitrust laws, breach of contract, and allegations of fraud or misrepresentation in the sale of complex financial instruments, such as residential mortgage-backed securities (“RMBS”), foreign exchange products, and other derivative instruments.

Jenn focuses a significant portion of her practice on the representation of trustees, issuers, underwriters, sponsors, originators, and servicers arising in litigations, internal investigation, and government investigations arising out of their roles in RMBS transactions. In addition, Jenn represents clients in the mortgage industry in foreclosure and other loss mitigation proceedings, indemnification actions, and putback litigations. Jenn also counsels clients in the financial services space relating to risk management and regulatory issues arising out of legacy RMBS platforms, LIBOR transition issues, and other deal management issues.

Jenn also has extensive experience counseling clients on e-discovery issues, including the crafting of policies and procedures to govern document retention, legal holds, document collection and review, as well as strategies for defensible management of data in large litigations.

From 2014 through 2018, Super Lawyers named Jenn to its New York Metro “Rising Stars” list in the area of Business Litigation.

Jenn joined Mayer Brown in 2008, prior to which she was associated with a prominent New Jersey-based law firm.

Spoken Languages

  • English


  • Defended a leading global bank against allegations that the bank assisted a rogue foreign exchange trader in concealing more than $700 million in foreign exchange trading losses.
  • Represented a leading global bank against allegations of securities law violations arising out of its issuance and underwriting of $6.2 billion of residential mortgage-backed securities.
  • Defended a major financial services company and various of its banking and broker-dealer affiliates against claims by monoline insurers alleging aiding and abetting fraud of various subsidiaries in connection with their sponsoring of residential mortgage-backed securities transactions and breach of contract claims in connection with the governing transactional documents.
  • Represents several global banks and financial services companies, and affiliates entities, in responding to subpoenas from the Securities and Exchange Commission, the Department of Justice, and various state Attorneys General arising out of their roles in residential mortgage-backed securities transactions.
  • Represents trustees of residential mortgage-backed securities transactions in litigations and other matters relating to their roles as trustee.
  • Defended major mortgage loan originator against indemnification claims asserted by deal counterparty.
  • Defended global bank in various antitrust matters involving allegations of price fixing relating to certain bond instruments.
  • Defended a leading pharmaceutical corporation in an internal investigation and securities litigation arising out of a clinical trial.
  • Represents leading auto manufacturer in various class action lawsuits related to alleged manufacturing defects.


Fordham University School of Law, JD, magna cum laude
Dean's List; Order of the Coif

Fordham University, BA, magna cum laude
Dean's List, Phi Beta Kappa


  • New York
  • New Jersey


  • US Supreme Court
  • US District Court for the Eastern District of New York
  • US District Court for the Southern District of New York
  • US District Court for the District of New Jersey
  • US Court of Appeals for the Second Circuit