Matthew J. Sill

About

Matthew J. Sill focuses his practice on mass tort, class action, and catastrophic injury litigation. He currently serves as outside counsel to the Oklahoma Attorney General in matters involving natural gas market manipulation (Winter Storm URI) and environmental contamination by Per- and polyfluoroalkyl substances (PFAS). Matt currently represents over one hundred cities, counties, and tribes in the nationwide opioid litigation, In Re: National Prescription Opiate Litigation, MDL No. 2804, Case No. 17-MD-02804. Matt also represents dozens of political subdivisions regarding the dangers of e-cigarettes, In Re: Juul Labs, Inc. Marketing, Sales Practices and Product Liability Litigation and “forever chemicals” In Re Aqueous Film-Forming Foams Products Liability Litigation MDL 2873. He is frequently selected for leadership positions among large groups of attorneys representing hundreds or thousands of plaintiffs. Matt was designated to serve in official leadership roles by presiding judges in the following matters:

• State Court/ MDL Liaison Counsel for MDL 3108, In Re: Change Healthcare, Inc. Customer Data Security Breach Litigation, currently pending in United States District Court for the District of Minnesota;
• Plaintiff’s Executive Committee for MDL 3026, In Re: Abbott Laboratories, et al., Preterm Infant Nutrition Products Liability Litigation, currently pending in United States District Court for the Northern District of Illinois Eastern Division;
• Co-Lead Counsel for MDL 2700, In Re: Genentech, Inc., Herceptin (Trastuzumab) Marketing and Sales Practices Litigation, currently pending in United States District Court for the Northern District of Oklahoma;
• Plaintiffs’ Steering Committee for MDL 2331, In Re: Propecia (Finasteride) Products Liability Litigation, currently pending in United States District Court for the Eastern District of New York;
• Plaintiffs’ Steering Committee for JCCP 4749, In Re: GranuFlo and NaturaLyte Litigation, currently pending in Los Angeles Superior Court;
• Lead Counsel, Appellate Liaison Counsel and State Court Liaison Counsel for MDL 2266, In Re: Darvon, Darvocet, and Propoxyphene Products Liability Litigation, in which Matt was previously a member of Plaintiffs’ Executive Committee;
• Class Counsel in Garcia v. Allergan, Case No. 11-cv-9811 PSG, in which physicians throughout the United States received settlement funds for purchasing Botox Cosmetic based on off-label promotion; and
• Counsel in Continental Resources, Inc. Shareholder Litigation, Case No. CJ-2022-4162, currently pending in Oklahoma County District Court.

Matt successfully helped thousands of families impacted by non-Hodgkin lymphoma following exposure to Roundup®. He was also instrumental in fulfilling his firm’s co-lead counsel responsibilities for the BOK National Settlement Class from MDL 2036, In Re: Checking Account Overdraft Litigation, Plaintiffs’ Steering Committee (“PSC”) duties for MDL 1871, In ReMatt successfully helped thousands of families impacted by non-Hodgkin lymphoma following exposure to Roundup®. He was also instrumental in fulfilling his firm’s co-lead counsel responsibilities for the BOK National Settlement Class from MDL 2036, In Re: Checking Account Overdraft Litigation, Plaintiffs’ Steering Committee (“PSC”) duties for MDL 1871, In Reecade, Matt’s firm represented the largest number of “fen-phen” claimants in the nation. His team also assisted with PSC obligations in the multibillion-dollar global settlement program of MDL 2299, In Re: Actos Products Liability Litigation, the largest single mass tort settlement involving a drug that is still on the market.

In multiple matters before the United States Court of Appeals for the Sixth Circuit and the United States Court of Appeals for the Ninth Circuit, Matt represented hundreds of people allegedly injured or killed by generic prescription drugs. See, e.g., Romo v. Teva Pharmaceuticals USA, Inc. He also appeared before the United States Court of Appeals for the Tenth Circuit on behalf of several hundred women bringing claims against vaginal mesh manufacturers. See, e.g., Teague et al. v. Johnson & Johnson et al.

Matt serves on the Executive Committee and Board of Directors in the Oklahoma Association for Justice. He was previously elected to the Board of Governors in the American Association for Justice (formerly ATLA) for many years.

Matt regularly accepts invitations for faculty positions and speaking engagements at seminars and continuing legal education programs. His most recent CLE programs have been on the Change Healthcare Cyberattack impacting healthcare providers and Necrotizing Enterocolitis (NEC) in premature infants. He has lectured in numerous locations, including Arizona, Florida, Georgia, Illinois, Louisiana, New York, Oklahoma, Colorado, Puerto Rico, and Texas. He was chosen to co-chair Harris Martin Publishing’s CAT Flood and Windstorm Litigation Conference. In the practice area of pharmaceutical and medical device litigation, Matt has been a featured instructor or moderator at educational programs devoted to Actos®, GranuFlo®, Topamax®, pre-emption in generic drug cases, and several other topics. He has authored a number of articles; up-to-date information on relevant publications and published legal opinions are available by request from: [email protected].

Matt has successfully helped families and individuals involved in securities litigation, anti-trust litigation, diabetes drug litigation, birth control litigation, gadolinium-based contrast dye litigation, hip replacement litigation, fentanyl pain patch litigation, heart defibrillator lead litigation, Las Vegas hepatitis litigation, Chinese drywall litigation, hormone replacement therapy litigation, denture cream litigation, heart surgery products litigation, dialysis products litigation, and aircraft crash litigation, to mention only a few.

Matt received his law degree from Whittier College in Southern California (J.D. 2005), and his bachelor’s degree in business administration from the University of Oklahoma (B.B.A 2000). He is admitted to practice in Oklahoma and Missouri. Prior to attending law school, Matt worked for a well-known talent and literary agency in Beverly Hills, Calif., and as a campaign official in a successful gubernatorial race in Oklahoma. As a law student, he consistently worked as a clerk to the senior partner of a high-profile mass tort firm in Los Angeles.

Oklahoma Association for Justice

American Association of Justice

Lawdragon 500 Leading Plaintiff Consumer Lawyer 2022

Lawdragon 500 Leading Plaintiff Consumer Lawyer 2022

Lawdragon 500 Leading Plaintiff Consumer Lawyer 2023

LawDragon 500 Leading Plaintiff Consumer Lawyer 2024

LawDragon 500 Leading Plaintiff Consumer Lawyer 2025