Brett M. McMahon
  1. Counsel

Mr. McMahon is counsel in Davis Polk’s Litigation Department. He represents clients in a variety of civil and white collar criminal matters, including in complex commercial and contractual disputes, professional liability litigation, securities litigation, bankruptcy litigation, and criminal and regulatory investigations by federal and state government agencies. A significant portion of his practice involves defending major law firms against legal-malpractice and breach-of-duty claims. He also advises clients on litigation risk in the context of potential transactions and otherwise outside of actual litigation.

Bar Admissions

  • State of New York
  • U.S. Court of Appeals, Fifth Circuit
  • U.S. District Court, E.D. New York
  • U.S. District Court, S.D. New York


  • B.A., Political Science, University of Richmond, 2003
    • cum laude
  • J.D., University of Southern California Gould School of Law, 2006
    • Order of the Coif
    • Senior Editor, Southern California Law Review

Professional History

  • Davis Polk since 2007
  • Law Clerk, Hon. Cynthia M. Rufe, U.S. District Court, E.D. Pennsylvania, 2006-2007