Duffy M. Matthew

Matthew M. Duffy


  • University of Notre Dame Law School, J.D., summa cum laude, 2013
    • Executive Editor, Notre Dame Law Review, Volume 88
  • Pace University, M.S. Ed., 2009 (Teach For America Corps Member)
  • University of Notre Dame, B.A., summa cum laude, 2007


  • Law Clerk, Judge Kim M. Wardlaw, U.S. Court of Appeals, Ninth Circuit, 2014-2015
  • Law Clerk, Judge Charles R. Wilson, U.S. Court of Appeals, Eleventh Circuit, 2013-2014


  • 2013, Indiana
  • 2016, District of Columbia

Matthew M. Duffy litigates a wide variety of complex, high-stakes disputes.  He has extensive experience litigating contractual, securities, telecommunications, antiterrorism, public nuisance, fraud, and deception cases on behalf of both plaintiffs and defendants.  Matt practices before state and federal courts and agencies, and in international arbitration.  He advises clients on pre-litigation strategy and supports clients throughout all stages of litigation, including fact and expert discovery and trial.

Representative Experience

  • Served as counsel for State of Florida in a lawsuit against opioid manufacturers, distributors, and dispensers, alleging that these defendants contributed to the opioid crisis in Florida.  The case settled during the fourth week of trial, at which point Florida had recovered more than $3.5 billion from the defendants.  Matt was involved in all aspects of the litigation, including overcoming defendants’ dispositive motions, taking and defending depositions, coordinating expert discovery, and preparing witnesses for trial.
  • Represented the National Credit Union Administration in a series of lawsuits against major financial institutions to recover losses arising from the 2008 financial crisis.  In a series of securities suits regarding the sale of residential mortgage-backed securities, Matt helped NCUA secure more than $5.1 billion.
  • Advising telecommunications clients on retransmission consent issues, including securing the Federal Communications Commission’s first-ever finding that a broadcast station violated good-faith negotiation rules on behalf of AT&T and DirecTV.
  • Representing U.S. service members, civilians, and their families in a terrorism lawsuit against Johnson & Johnson, Pfizer, GE Healthcare, AstraZeneca, and Roche for bribing Jaysh al-Mahdi terrorists in Iraq.  Worked on appeal leading to unanimous D.C. Circuit decision reversing dismissal of claims.


  • Named among Best Lawyers in America®:  Ones to Watch for Commercial Litigation by Best Lawyers (2024)