John A. Markus
  • Associate Attorney
Columbus, OH

John Markus joined Leeseberg & Valentine in October 2015 as an associate attorney focusing his practice on medical malpractice and personal injury law.

Prior to joining the firm, John attended the University of Cincinnati College of Law where he focused his education on practical, hands-on litigation experiences. While in law school, John was a member of the Trial Practice and Moot Court teams, where he received the University Award for advancing the national reputation of the moot court program and was inducted into the Order of the Barristers, a national honor society for students demonstrating outstanding oral and written advocacy skills. Additionally, John served as a law clerk to the Honorable Ethna M. Cooper at the Hamilton County Court of Common Pleas and worked as a legal fellow for the Ohio Innocence Project where he played a significant role in the exoneration of Ricky Jackson, the longest serving wrongfully convicted person in US history.

Prior to law school, John graduated cum laude from The Ohio State University with a Bachelor of Arts in political science.

Areas of Practice

  • Medical Malpractice
  • Personal Injury Law

Bar Admissions

  • Ohio, 2015


  • University of Cincinnati College of Law, Cincinnati, Ohio
    • Honors: University Award
    • Honors: Order of the Barristers
    • Honors: Dean's List
    • Honors: Law Journal: Ohio Tort Law Journal, 2014 - 2015
  • The Ohio State University
    • Bachelor of Arts - 2011
    • Honors: cum laude
    • Honors: Dean's List
    • Major: Political Science

Published Works

  • Baldwin's Ohio Practice: Tort Law 2d, West, December, 2015

Professional Associations and Memberships

  • Ohio State Bar Association, Member
  • Columbus Bar Association, Member
  • Ohio Association of Justice, Member
  • Central Ohio Association of Justice, Member

Past Employment Positions

  • Law Clerk, Honorable Ethna M. Cooper at the Hamilton County Court of Common Pleas
  • Legal Fellow for the Ohio Innocence Project

Pro Bono Activities

  • The Ohio Innocence Project, 2013 to 2014
  • High School Mock Trial, Coach, 2015 to 2016

Our Successes

$44.5 million Verdict for injured 9 year-old in Franklin County, Ohio

$8 Million Settlement for 18 Patients who took Baycol

$6.5 Million Franklin County Wrongful Death and Survivorship Jury Verdict

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