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				Mahon, Jr.
Medical malpractice defense litigator

John Mahon, Jr.

Member in St. Louis

John Mahon has amassed jury trial and appellate victories in representing hospitals, emergency departments, ambulatory surgery centers, urgent care centers, emergency medical services (EMS) providers, long-term care facilities, medical practice groups, home health agencies, and a wide range of individual healthcare providers. In addition to chairing Baker Sterchi's Healthcare Practice Group, John is frequently sought out to educate healthcare providers on legal issues.


  • Missouri
  • Illinois
  • USDC, Eastern District of Missouri
  • USDC, Western District of Missouri


  • Saint Louis University School of Law, J.D., 2004
    • Editor, Saint Louis University Law Journal
  • Boston College, B.A., magna cum laude, 2001
  • King’s College London, 1999

Memberships & Activities

  • Association of Defense Trial Attorneys
    •  Social Media Committee
  • Bar Association of Metropolitan St. Louis
  • DRI
    • Insurance Law Committee
    • Online Community Vice-Chair, Medical Liability & Health Care Law Committee (2023-2024)
  • Lawyers Association of St. Louis
    • Executive Committee (2009 – 2013) 
  • Missouri Organization of Defense Lawyers
  • St. Louis Association of Healthcare Risk Managers
  • St. Louis County Bar Association
  • Theodore McMillian American Inn of Court
    •  Barrister (2014 – 2017)

Awards & Recognition

  • Martindale-Hubbell AV Preeminent Peer Review Rated
    • Medical Malpractice
    • Personal Injury
  • The Best Lawyers in America, St. Louis Metropolitan Area, 2016-present
    • Insurance Law (2018-present)
    • Medical Malpractice Law – Defendants (2024)
    • Personal Injury Litigation – Defendants (2019-present)
    • Product Liability Litigation – Defendants (2016-present)
  • Missouri & Kansas Super Lawyers, 2019-present
  • Missouri & Kansas Super Lawyers Rising Stars, 2010-2018
  • Missouri Lawyers Media Top Defense Verdict/Settlement, 2007 & 2018
  • Missouri Lawyers Media Up & Coming Award, 2011
  • Missouri Lawyers Media Top Plaintiff Verdict/Settlement, 2009
  • BAMSL Young Lawyers’ Division Inaugural Trial Advocacy Competition Best Oral Advocate Award, 2007

Community Involvement

  • St. Louis College of Health Careers - Advisory Board
  • Saint Louis Art Museum - Young Friends Steering Committee
  • Saint Louis University High School - Alumni Board


  • New Law Brings Necessary Clarity to Punitive Damages in Missouri - Health care providers are less likely to face harsh judgments, St. Louis Metropolitan Medicine Magazine (February/March 2021)


  • Speaker, “Legal Issues for Health Care Providers”, Student Nurse Association, St. Louis Community College-Forest Park campus (October 2022, March 2022, November 2019, August 2018, April 2017, September 2015, September 2014)
  • Speaker, "Fundamentals of a Medical Malpractice Case", Missouri State Medical Association Annual Convention, with Josh Davis and Nate Leming (March 2018)
  • Speaker, “Legal Update Panel – Tort Reform Legislation”, Washington University / BJC HealthCare Defense Counsel Seminar (November 2017)
  • Speaker, “Legal Issues for Health Care Providers”, Fundamentals of Nursing, St. Louis Community College-Meramec Campus (November 2014)
  • Speaker, “Legal Issues for Health Care Providers”, Practical Nursing/Respiratory Therapy Programs, St. Louis College of Health Careers (November 2017, November 2014, May 2014, October 2013)
  • Speaker, “Legal Issues for Nurses”, Trends Nursing Program, Jefferson College School of Health Professionals (April 2012)

News & Events

Blog Posts


Trial court's dismissal of hospital client upheld on appeal

In this medical negligence case involving allegations that a patient was dropped or mishandled on one or more occasion, causing significant injuries to her right femur and patella, the trial court dismissed the plaintiff's re-filed survival claim against our hospital client on statute of limitations grounds. On appeal, the Missouri Court of Appeals, Eastern District...

Trial of Medical Malpractice Case Results in Defense Verdict for Hospital Client

In a trial win reported by Missouri Lawyers Weekly (Volume 33, Number 7, February 18, 2019) as a 2018 Missouri Top Defense Verdict, an eight-person jury deliberated for four hours after a five-day federal court trial in the Eastern District of Missouri, unanimously siding with our hospital client and an emergency room physician sued for medical malpractice by a teenager who suffered a severe bacterial infection after a piece of a broken stick remained lodged in his leg.

Dismissal of hospital client upheld on appeal

In a medical negligence case arising from a month-long hospitalization and significant brain injury, the trial court dismissed the case against our hospital client due to plaintiff's counsel's failure to timely re-file it after a voluntary dismissal. On appeal, the Missouri Court of Appeals, Eastern District...

Defense Verdict Secured for Hospital Client in Medical Malpractice Trial

In a medical negligence case arising from postoperative care and treatment following ankle surgery, plaintiff alleged negligent failure to timely diagnose and treat an ankle joint infection that left her with permanent and painful injuries after multiple surgical procedures and lengthy hospitalizations to treat the infection.