Co-leader, Professional Liability

Brian J. Massengill

Securities Litigation & Enforcement, Litigation & Dispute Resolution


Brian Massengill offers clients a heightened focus on the intersection of litigation with accounting and finance issues. With his background as a Certified Public Accountant who spent eight years working at a national accounting firm, clients know they can trust Brian’s advice on a variety of matters related to securities class actions, SEC and PCAOB investigations, arbitrations, and state accountancy board proceedings.



  • LKCM and affiliates in suit alleging breaches of fiduciary duty relating to the acquisition of certain portfolio companies in Delaware Chancery Court.
  • TC Energy in securities class action, and fiduciary duty and appraisal actions in Delaware Chancery Court.
  • TC Energy in breach of representation and warranty litigation relating to the sale of assets to Helix Generation in Delaware Superior Court.
  • Moore Stephens Hong Kong in securities class action litigation and regulatory investigations relating to Puda Coal, Inc.

Formação Acadêmica

  • The University of Chicago Law School, JD
    University of Chicago Law Review
  • Registered Certified Public Accountant (CPA), Illinois
  • Indiana University, BS, Accounting


  • New York
  • Illinois


  • US Court of Appeals for the Second Circuit
  • US Court of Appeals for the Third Circuit
  • US Court of Appeals for the Seventh Circuit
  • US District Court for the Northern District of Illinois
  • US District Court for the Southern District of New York