John A. Markus

Attorney Profile

Top Rated Medical Malpractice Attorney in Columbus, OH

Leeseberg & Valentine
 | 175 South Third Street, Penthouse One, Columbus, OH 43215
Phone: 614-221-2223
Fax: 614-221-3106
Selected To Rising Stars: 2020
Licensed Since: 2015
Practice Areas:
  • Personal Injury - Medical Malpractice: Plaintiff (70%),
  • Personal Injury - General: Plaintiff (30%)
Attorney Profile

John A. Markus has been an associate at Leeseberg & Valentine since October 2015. Based in the firm's office in Columbus, Ohio, he focuses his practice exclusively on personal injury and wrongful death litigation, representing clients throughout the state, and he is admitted to practice before all Ohio state courts.

In his practice, Mr. Markus provides aggressive representation to people who have incurred economic and noneconomic losses due to the negligence or recklessness of other parties. He places a particular emphasis on medical malpractice cases, including those involving surgical errors, medication mistakes and misdiagnoses. Other types of matters that Mr. Markus has handled during his career have included motor vehicle accidents and defective products, and he has been able to obtain significant compensation for his plaintiff clients, both through jury awards and settlements that he has negotiated out of court with defendants and their insurance companies.

Majoring in political science, Mr. Markus attended The Ohio State University in Columbus as an undergraduate. While he was there, he was the vice president of a student-run community service organization and served as a public safety associate for the Cincinnati Reds major league baseball franchise before obtaining his Bachelor of Arts cum laude in 2011. After graduation, Mr. Markus worked as a fiscal associate for his alma mater before deciding to pursue a legal education. He then enrolled at the University of Cincinnati College of Law, and he was a member of the school's Moot Court Honor Board and was a judicial extern for a judge on a Hamilton County court before being awarded his Juris Doctor in 2015. His professional memberships include the Central Ohio Association for Justice and the Columbus Bar Association.

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


top-imageSelected to Rising Stars for 1 years

Rising Stars: 2020

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About John Markus

Admitted: 2015, Ohio

Professional Webpage:

Bar/Professional Activity:

  • Central Ohio Association of Justice, Member 
  • Columbus Bar Association, Member
  • Ohio Association of Justice, Member
  • Ohio State Bar Association, Member
  • Ohio, 2015 

Pro bono/Community Service:

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

Scholarly Lectures/Writings:

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

Educational Background:

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

175 South Third Street, Penthouse One
Columbus, OH 43215

Phone: 614-221-2223

Fax: 614-221-3106

John A. Markus:

Last Updated: 1/13/2020

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