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John Patrick O'Neil

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About me

John P. O'Neil joined Elk & Elk Co., Ltd. in 2012 as an equity partner. He is one of the firm's leading medical malpractice and personal injury attorneys, whose practice focuses primarily upon death and catastrophic loss cases. Prior to joining Elk & Elk, John spent 14 years at one of Ohio’s top defense law firms, where he served as a practice area chair and member of the firm's management committee and executive group. He also spent time working as a successful prosecutor in the Dade County State Attorney's Office. Over the years, John has successfully tried more than 80 jury trials in various areas of law, including medical malpractice, transportation, legal malpractice, premises liability and others. John's first chair jury trials are in state and federal courts, and he has argued in the Eighth District Court of Appeals, Ohio Supreme Court and Sixth Circuit Court of Appeals.

John practices with the Ohio firm of Elk & Elk Co., Ltd., located in Mayfield Heights. He received his undergraduate degree from Miami University in Oxford, Ohio and his law degree from John Marshall Law School in Chicago, Illinois.

John is married and has four children.


Practice areas


  1. Medical Malpractice: 50%
    21 years
  2. Personal Injury: 50%
    21 years



Contingent (33-40%), Free consultation (60 minutes)

Attorney endorsements

10 total 

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  • Michael S. Waddington

    I endorse John. He is a highly skilled attorney that is well respected in the legal community.


    Michael Waddington Military Law Attorney
    Relationship: Fellow lawyer in community

  • James Peter Sammon

    John is one of the most thorough and diligent legal professionals in Northeast Ohio. A dedicated litigator who leaves no stones unturned.


    James Sammon Business Attorney
    Relationship: Worked together on matter

Contact info

Elk & Elk Co., Ltd - Cleveland

6105 Parkland Blvd.
Mayfield Heights, OH, 44124

Elk & Elk Co., Ltd. - Columbus

250 E. Broad Street
10th Floor
Columbus, OH, 43215

Elk & Elk Co., Ltd. - Cincinnati

2021 Auburn Ave.
Cincinnati, OH, 45219



FLMember in Good Standing199409/08/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Super LawyerOhio Super Lawyers2015
Super LawyerOhio Super Lawyers2014
Top 100 OhioOhio Super Lawyers2014
Top 50 ClevelandOhio Super Lawyers2014
Super LawyerOhio Super Lawyers2013
Top 100 OhioOhio Super Lawyers2013
Top 50 ClevelandOhio Super Lawyers2013
Super LawyerOhio Super Lawyers2012
Work experience
TitleCompany nameDuration
PartnerElk & Elk Co., Ltd.2012 - Present
ShareholderReminger & Reminger Co Lpa1998 - 2012
ProsecutorDade County State Attorney's Office (Miami, Fl)1994 - 1997
Association namePosition nameDuration
Federal Bar Association (Northern District of Ohio chapter)Board Member2015 - Present
Ohio Association for JusticeMember2012 - Present
American Bar AssociationMember2012 - Present
American Association for JusticeMember2012 - Present
Ohio State Bar AssociationMember2012 - Present
Cleveland Metropolitan Bar AssociationMemberN/A
Legal cases
Case nameOutcome
John Doe v. ABC Transportation Company, et al$5 million
See all legal cases 
School nameMajorDegreeGraduated
John Marshall Law SchoolN/AJD - Juris Doctor1994
Miami University of OhioN/ABS - Bachelor of Science1988