About The Lyon Firm

The Lyon Firm is a Cincinnati, Ohio-based public interest law firm representing individuals and small businesses nationwide. The Firm maintains a diverse and sophisticated practice focused on complex consumer class actions, product liability, and catastrophic injury litigation. Led by founder and managing partner Joseph M. Lyon, the Firm consists of five attorneys licensed in Ohio, California, Kentucky, Illinois, Missouri, and Arizona, as well as numerous federal courts. 

For over 20 years, the Firm’s highly selective work has focused on high-impact litigation that drives positive corporate change and accountability. Recognized as a national leader in complex litigation, the Firm has a proven history of exposing dangerous business practices and defective products in industries where regulatory oversight has lagged, bringing attention to serious consumer risks.  

The Lyon Firm works with a large network of consumer advocacy groups, experts, whistleblowers, and law firms to promote a safer, more sustainable marketplace while advancing effective compensatory models for individual clients and class members. Notably, the Firm has contributed to the success of over 70 consumer class actions, over 40 multi-district mass tort litigations, and over 100 single-event catastrophic injury matters covering a wide range of liability issues. The Firm’s diverse practice includes cases arising from personal data misuse, AI negligence, IVF malpractice, automotive product defects, firearm defects, medical malpractice, workplace injuries, consumer product toxic exposure, environmental contamination, and industrial toxic exposure (including asbestos, lead, radiation, benzene, and TCE).

Collectively, the Firm’s work has contributed to numerous highly publicized settlements that have created over $800 million in gross offered value for consumers, generated more than $550 million in recovered value for clients and class members, and contributed to broad industry reforms.

Federal and state courts frequently appoint The Lyon Firm to leadership positions in large complex class action cases. Over the past four years, the Firm has served in leadership for cases collectively impacting over 50 million class members. The Firm has been particularly active at the forefront of data privacy and digital surveillance litigation, developing novel legal theories at the crossroads of consumer privacy, healthcare, and marketing technology. Some of the more prominent cases include:
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Henderson v. Reventics, LLC, Case No. 2025CV30456 (Colo. Dist. Ct.) (co-lead counsel) — $8.125 millioncommon fund settlement arising from a healthcare data breach;

‍In re Christ Hospital Pixel Tracking, Case No. 2204749 (Hamilton County, Ohio) (co-lead counsel) —$12.445 million hybrid fund settlement involving healthcare tracking technologies;

‍Miller v. NextGen Healthcare, Inc., Case No. 1:23-cv-02043 (N.D. Ga.) (executive committee) — $19.75 million common fund settlement arising from ahealthcare data breach. 

Prior to its notable class action work, the Firm built a national reputation through its mass tort practice, which included representing over a thousand individuals through the MDL process. Joe Lyon has worked alongside leadership in some of the largest mass tort proceedings in U.S. history:     

‍In re Ethicon, Inc. Pelvic Repair Systems Product Liability Litigation, MDL No. 2327: Discovery committee member; assisted in preparation for corporate 30(b)(6) depositions, opinion leader depositions, and bellwether trials;      

‍In re Testosterone Replacement Therapy Products Liability Litigation, MDL No. 1748: Discovery & expert committee member; tasked with liability theories, expert retention, regulatory and custodial file review;      

‍In re Actos (Pioglitazone) Products Liability Litigation, MDL No. 2299: Trial team member in favorable bellwether trial in Philadelphia County;       

‍In re Roundup Products Liability Litigation, MDL No. 274: Served as a member of the initial plaintiff marketing and vetting committee that initiated the first wave of filed cases;

‍In re Pam Cooking Spray Explosion Litigation: Contributed to motion practice and discovery; document review and depositions.

Firm members have also represented plaintiffs in high-stakes catastrophic personal injury cases against major corporations and large healthcare systems, requiring the Firm to consistently innovate and expand its core practice. The Firm continues to develop impactful case themes, design unique discovery plans, advance expert testimony, and improve trial readiness. This work has helped families facing profound losses to obtain answers, accountability, resources for long-term medical care, and life-changing compensation.

The Firm works with a large network of consumer advocacy groups, experts, journalists, whistleblowers, and other law firms in its internal investigations. When cases proceed to litigation, the Firm frequently expands its working knowledge in relevant subject areas, forms impactful case themes, designs unique discovery plans, develops expert testimony, and regularly prepares cases for trial. The litigation is often strengthened by the sheer power in numbers, multiple litigation tracks, and the collaboration of various sub-committees within the litigation. The Firm recognizes the importance of coordination among law firms with the same collective goals, and consistently works within these established relationships for the benefit of the class and its clients.