Michael Kosner

Michael Kosner has been practicing law in Chicago since 1998. After graduating from the University of Miami, he practiced in southern Florida before returning to Chicago, where he was raised in the northern suburbs. In 2018, he became a partner at Deratany & Kosner.


In 2005, at the age of 35, Mr. Kosner effectuated one of the largest stillbirth settlements in Illinois history. The case was settled in fewer than 90 days from the time he started working on it.

In 2009, Mr. Kosner settled the second largest wrongful death/medical malpractice case ever against Cook County Hospital. The settlement of $9.8 million was achieved just over two years after the filing of the lawsuit. The average medical malpractice case in Cook County takes more than three years to resolve.

Practice Areas

  • Medical Malpractice
  • Birth Injury
  • Nursing Home Negligence
  • Car Accidents
  • Truck Accidents
  • Personal Injury
  • Wrongful Death


  • Juris Doctor, University of Miami Law School, Miami, FL
  • Bachelor’s, University of Kansas, Lawrence, KN

Professional Associations/Memberships

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


  • Illinois Super Lawyers 2017-2019
MICHAEL KOSNER ATTORNEY SPOTLIGHT: 1994- Graduated from University of Kansas; 1997- Juris Doctor, University of Miami; 2005- Effectuated one of the largest stillbirth settlements in Illinois history; 2009- Settled 2nd largest wrongful death/ medical malpractice case against Cook County Hospital; 2016- Became a partner at Deratany & Kosner (formerly The Deratany Firm); 2017-2019. 2021 Included in Illinois Super Lawyers list.


Mr. Kosner is a devoted family man. He lives in Chicago with his wife and two children.