David K. Duffey



David Duffey concentrates his practice on professional negligence work and the defense of medical providers, groups and hospitals from pre-suit investigation through trial and appeal. Additionally, he represents clients in general tort and premises liability matters and has extensive experience in defending clients in all stages of litigation. He joined the firm in 2015 following two years at a Chicago litigation firm. Since joining the firm, he has been recognized as an Illinois Rising Star and an Emerging Lawyer based on excellence and peer recognition from other attorneys in Illinois.

Mr. Duffey graduated from Loyola University Chicago School of Law where he received the Joan Marie Corboy Scholarship for Achievement in Advocacy and participated in Loyola’s Moot Court program. He currently serves as one of the coaches for the Honors Appellate Advocacy Program. Prior to law school, he earned his undergraduate and graduate degrees from the University of Notre Dame.



  • J.D., Loyola University Chicago, cum laude, 2012
  • M.Ed., University of Notre Dame, 2009
  • BA., University of Notre Dame, 2007


  • Leading Lawyer – Emerging Lawyer (2018-2020)
  • Illinois Super Lawyer – Rising Star (2017-2021)
  • Best Lawyers: Ones to Watch (2021)
    • Medical Malpractice Law-Defendants
    • Personal Injury Litigation-Defendants
  • Best Lawyers: Ones to Watch (2022)
    • Medical Malpractice Law-Defendants
    • Personal Injury Litigation-Defendants


  • Illinois, 2012
  • U.S. Disctrict Court for the Northern District of Illinois, 2015


  • Anatomy of a Medical Malpractice Trial, Chicago Bar Association


Plaintiff v. Defendant Neurosurgeon

01/17/2020 Client:

Defendant Neurosurgeon


Verdict for Defense.

Mark M. Burden and David K. Duffey successfully defended a neurosurgeon at trial against allegations of negligence for improperly recommending and improperly performing an extensive neurosurgical procedure. Plaintiffs alleged that ...


Plaintiff v. Defendant Internist/Cardiologist

10/12/2017 Client:

Defendant Internist/Cardiologist


Verdict for the Defense.

DBMS secured a verdict for the defense in a case in which medical negligence was alleged after a woman with multiple health conditions died after suffering a fatal cardiac arrhythmia. ...


In the news

Election of New Partner, David K. Duffey

Donohue Brown Mathewson & Smyth LLC is excited to announce the election of David K. Duffey as a partner in ...

12 DBMS attorneys named to 2021 Illinois Super Lawyers and Rising Stars list

Donohue Brown Mathewson & Smyth LLC is pleased to announce that 12 attorneys have been recognized in the most recent ...