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Michael A. Kosner

Attorney Profile

Top Rated Medical Malpractice Attorney in Chicago, IL

The Deratany Firm
221 North La Salle Street, Suite 2200
Chicago, IL 60601
Phone: 312-815-6231
Fax: 312-857-2004
Selected to Super Lawyers: 2017 - 2019, 2021 - 2022
Licensed in Illinois Since: 1999
Practice Areas: Personal Injury - Medical Malpractice: Plaintiff, Personal Injury - General: Plaintiff
Attorney Profile

Attorney Michael A. Kosner is a partner with Deratany & Kosner law firm in Chicago, Illinois. A top-rated trial lawyer with more than 23 years of total legal experience, Mr. Kosner provides invaluable counsel and support to clients throughout the greater Chicago metro and surrounding areas who have suffered a catastrophic injury or lost a loved one due to someone else's negligence or wrongdoing.

Over the course of his legal career, Mr. Kosner has recovered millions of dollars in total compensation for his plaintiff clients adversely affected by medical malpractice, birth injuries, nursing home abuse, car and truck accidents, and other preventable tragedies. Among his most notable success, he secured a verdict of more than $8 million for the wrongful death of a medical patient and a $6 million verdict for the family of the victim of misdiagnosed brain aneurysm.

Mr. Kosner has secured many other multimillion-dollar settlements and verdicts for his clients, and he has gained a reputation as a fierce and tireless advocate for those he serves. As an attorney, he thoroughly prepares every case he handles as if it were to go to trial in order to send a strong message to opposing counsel of his readiness to take the matter to court if necessary. He has found doing so often opens the doors to settlement negotiations.

A 1994 graduate of the University of Kansas, Mr. Kosner attended the University of Miami School of Law, where he obtained his Juris Doctor in 1997. The Florida Bar admitted him to practice that same year, and he received his license to practice in Illinois in 2000. He is an active member of the Illinois State Bar Association, among his other professional affiliations.

Practice Areas
  • 70%Personal Injury - Medical Malpractice: Plaintiff
  • 30%Personal Injury - General: Plaintiff
Focus Areas

Medical Malpractice, Birth Injury, Delayed or Incorrect Diagnosis, Informed Consent, Assault, Motor Vehicle Accidents, Personal Injury - Plaintiff, Slip and Fall, Wrongful Death, Construction Accident, Brain Injury, Sexual Abuse - Plaintiff, Trucking Accidents, Premises Liability - Plaintiff


5 Years Super Lawyers
  • Super Lawyers: 2017 - 2019, 2021 - 2022

About Michael A. Kosner

First Admitted: 1997, Florida

Professional Webpage:


  • Illinois Super Lawyers, 2017-2019

Bar/Professional Activity

  • Illinois Bar Association, Florida Bar Association, Illinois Trial Lawyers Association

Educational Background

  • Bachelor’s, University of Kansas, Lawrence, KN
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Office Location for Michael A. Kosner

221 North La Salle Street
Suite 2200
Chicago, IL 60601

Phone: 312-815-6231

Fax: 312-857-2004

Last Updated: 9/1/2021

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