Robert M.Tiefenbrun


Irvine + 1.949.553.7573

Robert Tiefenbrun is a commercial litigator with significant experience defending clients in shareholder litigation and representing financial services companies in various matters. He has represented clients ranging from individual shareholders to several of the world's largest banks.

Robert has experience in all stages of litigation and has represented clients in disputes relating to corporate fiduciary duties, federal securities laws, state and federal wire fraud statutes, unfair business practice laws, and the whistleblower provisions of the Dodd-Frank Act. He has significant experience defending class action lawsuits, as well as lawsuits involving complex financial issues such as credit ratings, mortgage-backed securities, and benchmark rates. Robert also has represented clients in internal investigations relating to regulatory matters including the Foreign Corrupt Practices Act, anti-money laundering diligence, derivative contracts, and algorithmic trading.

Prior to joining Jones Day in 2016, Robert practiced for five years at an international law firm in New York City.


  • Wells Fargo resolves derivative and putative class action claims alleging wrongdoing with respect to 272 residential mortgage-backed securities trustsJones Day successfully resolved three putative class actions filed by institutional investors in 272 residential mortgage-backed securities (RMBS) trusts.
  • Board of directors conducts internal investigation into related party transactions and workplace environment issuesJones Day was engaged by the board of directors of a company to conduct an internal investigation of alleged related party transactions, corporate governance issues, and the adequacy of prior internal reviews of alleged hostile workplace environment and harassment claims.
  • Ambry Genetics and directors defend class action alleging breaches of fiduciary dutyJones Day successfully represented Ambry Genetics Corporation ("Ambry") and its directors in the defense of a class action lawsuit alleging breaches of fiduciary duty filed by a minority stockholder arising out of the acquisition of Ambry by Konica Minolta and the Innovation Network Corporation of Japan.
  • Outside directors of Banc of California defend against series of derivative actions and related securities class actionJones Day is representing certain outside directors of the Banc of California, Inc. (NYSE: BANC), headquartered in Orange County, California, in connection with derivative actions and a related securities class action arising out of an internal investigation completed in 2017.
  • The following represents experience acquired prior to joining Jones Day.

    Represented major bank in a federal jury trial involving more than $600 million in damages alleged by a class of mortgage borrowers resulting in a favorable verdict and subsequent decertification of the class.

    Represented national ratings agency in actions brought by the DOJ and the California Attorney General alleging fraud, false advertising, and violations of the California False Claims Act.

    Represented major bank in defeating class certification in an action involving a $4 billion securities fraud claim.

    Represented major bank and its subsidiaries in investigations and an antitrust class action relating to alleged manipulation of benchmark rates including LIBOR and ISDAFIX.

    Represented former U.S. Attorney for the Southern District of New York in his role as the independent monitor pursuant to a deferred prosecution agreement.

    Represented the audit committee of a large semiconductor company in an investigation regarding FCPA compliance.

    Represented national ratings agency in a Dodd-Frank Act whistleblower action.

    Speaking Engagements

    • November 2016
      Securities Litigation: Using Data to Make the Case, presented by Bloomberg BNA