Skip to content Jason K. Winslow


St. Louis
211 North Broadway
Suite 2150
St. Louis, MO 63102

Southern Illinois
12 Wolf Creek Drive
Suite 100
Swansea, IL 62226


J.D., George Mason University School of Law, 2007

B.A., with high honors, University of Illinois at Urbana-Champaign, 2004 


Recognized by his peers as an "Emerging Lawyer" in the areas of Medical Malpractice Defense Law and Personal Injury Defense Law: General


Mr. Winslow is Co-Managing Partner of the St. Louis office. He maintains an active litigation and trial practice defending civil lawsuits involving malpractice claims against health care providers, lawyers, and other professionals.  He has also handled litigated matters involving commercial, products liability, employment, insurance coverage and general liability disputes for national insurance carriers, international corporations, and particularly in the health care setting for hospitals, physician groups, and individual providers. 

In the area of employment law, he has represented public and private employers in a wide range of litigated matters involving claims of racial, gender, sex, and other forms of discrimination, as well as health care institutions in matters involving privileges to practice medicine and credentialing claims. Jason partners with his clients to aggressively work up cases at their earliest stages with an eye toward developing a joint strategy for efficient management of each dispute, whether that involves alternative resolution or defense of the lawsuit through jury verdict at trial.

Health Care Defense

He has represented hospitals, physician groups, long-term care providers, mental health providers, and individual clients throughout the health care industry in high-stakes litigation involving catastrophic injuries, allegations of sexual assault, birth injuries, HIPAA data breaches, and COVID-19. Mr. Winslow has tried cases to defense verdict as lead counsel.  He also represents individual medical providers in licensing and disciplinary matters before administrative agencies.  While working at a prior law firm, he served as interim general counsel of a 200+ bed community-based Hospital.

Prior to joining GRSM, Jason served as National Health Care Practice Group Leader for an AM Law 200 national law firm.  He previously served as a judicial law clerk to the Honorable William D. Stiehl, United States District Court for the Southern District of Illinois. During law school, he was Editor-in-Chief of the Federal Circuit Bar Journal, a member of the Moot Court Board, and traveled with the National Trial Advocacy Team.  From 2015-2019, he was recognized by Leading Lawyers™ as an Emerging Lawyer, a recognition given to the top 2% of lawyers under 40 years of age.


  • Illinois
  • Missouri
  • U.S. District Court for the Southern District of Illinois
  • U.S. District Court for the Eastern District of Missouri


  • Defense Research Institute
  • Illinois Association of Defense Trial Counsel
  • Illinois State Bar Association
  • Illinois Society of Healthcare Risk Managers, Programs Committee
  • St. Clair County Bar Association
Publications & Presentations