Gregory Mortenson is an associate in the New York office of Latham & Watkins and a member of the firm’s Litigation & Trial Department. Mr. Mortenson has a diverse practice, with an emphasis on securities litigation, complex commercial litigation, and internal and regulatory investigations. He has litigated in both federal and state courts at both the trial and appellate levels around the country, on behalf of a diverse roster of clients. His wide-ranging experience encompasses everything from pre-dispute litigation avoidance through post-trial, framed by his vigorous yet pragmatic approach to problem-solving.

Mr. Mortenson also brings to bear relevant in-house experience from a secondment at a global financial services institution. Prior to joining the firm, Mr. Mortenson served as a judicial law clerk in the US District Court for the District of New Jersey, during which he received the Clarkson S. Fisher Historical Society Essay Award.

Mr. Mortenson attended the Seton Hall University School of Law on a full Presidential Merit Scholarship and served as editor-in-chief of Volume 43 for the Seton Hall Law Review. He graduated magna cum laude and was conferred the Order of the Coif. Mr. Mortenson attended Georgetown University, where he received a bachelor’s degree in business administration.

Mr. Mortenson’s experience includes representing:

  • Venture capital firm in multiple matters relating to digital assets & Web3
  • Semiconductor manufacturer in litigation and risk assessment related to cybersecurity incident surrounding M&A deal
  • Concert promoter in criminal investigation, Congressional inquiry, and civil litigations relating to a high-profile mass-casualty event
  • Global pharmaceutical company in complex securities litigation concerning generic drug pricing
  • Software company in parallel federal and state securities class actions
  • Industry clients in appeal concerning novel question of standing relating to direct listings, as amicus
  • Energy investment firm in trade secrets / NDA dispute
  • Global investment manager in a federal bench trial concerning the sale of disputed securities held in a CDO
  • Media/advertising company in a federal jury trial regarding employee non-disclosure and non-solicitation provisions
  • Global financial institution regarding alleged collusion in bond market, in internal investigation, government investigation, and multiple civil class actions
  • Hedge fund accused of breaching CDO governing documents
  • Energy company in a post-merger working capital dispute
  • Medical service provider in a securities class action and derivative action
  • International fashion brand in a contractual dispute with a critical vendor
  • Hedge fund in contract dispute with partner
  • International agricultural products company in a securities class action
  • Global alternative asset manager in litigation stemming from a PIPE transaction
  • National consumer products brand in consumer fraud class action regarding deceptive labeling
  • Global alternative asset manager in connection with an internal investigation of one of its funds regarding potential securities law violations
  • National retailer in connection with a FINRA inquiry
  • Former prisoner in a two-week federal jury trial alleging 8th Amendment violations 

Bar Qualification

  • New Jersey
  • New York


  • J.D., Seton Hall University School of Law
    Order of the Coif
  • BS, Georgetown University