Thomas Mannion

Managing Partner

Tom Mannion is the managing partner in the Cleveland, OH and Weirton, WV offices of Lewis Brisbois, a member of the Healthcare, Medical Malpractice, Products Liability, Toxic Tort & Environmental Litigation Practices, and vice-chair of the Architects & Engineers Practice. Mr. Mannion has developed a reputation as one of the nation’s top catastrophic injury defense trial lawyers, having obtained defense verdicts in cases involving cerebral palsy, ventilator dependent quadriplegia, paraplegia, traumatic brain injury, failed medical devices, necrotizing fasciitis and other viral and bacterial infections, severe burns, and death. His abilities and proven track record in the courtroom have resulted in some of the world’s largest companies and insurers calling him to defend their most serious cases in the most notorious jurisdictions. Mr. Mannion has parachuted into and defended catastrophic injury cases throughout the nation, including Florida, New York, Missouri, Illinois, Pennsylvania, Minnesota, West Virginia, Virginia, Kentucky, North Dakota, Michigan, Tennessee, Michigan, Ohio and other venues. Mr. Mannion also has extensive experience in class actions and multi-district litigation (MDLs), including actions involving pharmaceuticals, medical devices, environmental hazards, and professional services. 

Primary Area(s) of Practice

  • Healthcare
  • Medical Malpractice
  • Long-Term Care & Elder Law
  • Products Liability
  • Insurance Coverage
  • Bad Faith Litigation
  • Transportation
  • Labor & Employment
  • General Liability
  • Architects & Engineers
  • Construction
  • Toxic Tort & Environmental Litigation
  • National Trial Practice
  • COVID-19: Insurance Coverage
  • COVID-19: Labor & Employment
  • COVID-19: Construction/Contractors/Architects & Engineers



West Virginia

Supreme Court of Ohio

Supreme Court of West Virginia

United States District Court for the Northern District of Ohio

United States District Court for the Northern District West Virginia

United States District Court for the Southern District of West Virginia

United States District Court for the Eastern District of Michigan

United States Sixth Circuit Court of Appeals

Pro Hac Vice Admission to numerous State Courts


  • Ohio Bar Association
  • West Virginia Bar Association
  • CLM
  • Defense Research Institute
  • Cleveland Bar Association
  • Ohio Association of Civil Trial Lawyers


University of Akron School of Law, Akron, Ohio

Juris Doctor, summa cum laude, 1993 

University of Akron, Akron, Ohio

Graduate Studies in Psychology, 1988-1989

Bowling Green State University, Bowling Green, Ohio

Bachelor of Science, 1986

Lorain County Community College, Elyria, Ohio

Associate of Science, 1984

Community Service

Toys for Tots