Margaret Fitzsimmons


Margaret “Maggie” Fitzsimmons is a partner in the Chicago office of Lewis Brisbois and a member of the Medical Malpractice Department. Ms. Fitzsimmons’ practice also involves the representation of professionals including architects, engineers, and attorneys. She also has actively represented clients in general liability matters, class action litigation, and products liability cases. After admission to the Illinois Bar, Ms. Fitzsimmons has spent her career trying complex and significant matters to verdict in Illinois as well as many other states, both in the State Court and the Federal Court.

Mr. Fitzsimmons has tried a significant number of cases to verdict involving multi-million dollar exposures. Her practice areas and trial experience include medical malpractice, professional liability, general liability, construction matters, amusement claims, products liability, and employment matters. 

Primary Area(s) of Practice

  • Healthcare
  • Medical Malpractice

Additional Experience


Illinois Supreme Court

U.S. District Court for the Northern District of Illinois

U.S. District Court for the Northern District of Indiana

Trial Bar of the U.S. District Court for the Northern District of Illinois


  • International Association of Defense Counsel (IADC) – Member 2018-present
  • American Bar Association


Loyola University Chicago School of Law

Juris Doctor, cum laude

  • Deans List, Senior Editor of Annals of Health Law Journal
  • CALI Award for Excellence in Advocacy and Jurisprudence II

DePaul University

Bachelor of Arts in English and Dramaturgy, cum laude


  • "Prudential Mootness: Promised Out-of-Court Relief May Defeat Class Actions," International Association of Defense Counsel, February 12, 2013
  • "Defamation Claims Against Experts," The Critical Path, September 2007
  • "Potential Benefits and Risks of Offshore Outsourcing," The Critical Path, September 2007

Representative Cases

Her victories involving the successful defense of professionals and entities include the representation of:

  • An emergency-room physician who allegedly failed to diagnose an atypical aortic dissection
  • Defense of a man accused by his ex-wife of sexual assault, sexual slavery, and misconduct relating to their marriage
  • National representation of a South Korean medical device manufacturer sued in multiple jurisdictions throughout the country
  • Representation of an engineering firm sued in over a dozen wrongful death cases involving allegations relating to contaminated drinking water
  • Representation of an architectural firm accused of defective design of a major roadway