Mayer Brown announces new leaders of Mass Torts, Product Liability & Environmental Law practice

Mayer Brown is pleased to announce that partner Davina Pujari has been appointed leader of the firm’s Mass Torts, Product Liability & Environmental Law practice, one of the nation’s premier platforms for helping companies navigate complex litigation, regulatory challenges, and emerging risks.

Davina has tapped partners Chris Rheinheimer and Gina Aiello as deputy practice leaders, forming a leadership team that together has decades of experience litigating some of the country’s most complex environmental, product liability, mass tort, and aggregate litigation matters. Collectively, they have served as national counsel, lead trial counsel, and strategic advisors for clients facing complex coordinated proceedings, multidistrict litigation, government investigations and enforcement actions, environmental contamination claims, catastrophic injury litigation, and emerging-risk disputes across the United States.

Having joined Mayer Brown in September 2025, Davina brings more than 25 years of experience in environmental, civil, and criminal law. A nationally recognized environmental litigator and trial lawyer, she represents clients in major enforcement actions, contamination disputes, and high-profile matters under key federal and state laws. She also advises on investigations, crisis events, and complex challenges spanning legal, regulatory, operational, and reputational risk.

Chris is a leading environmental and mass tort litigator focused on complex disputes involving emerging contaminants, groundwater contamination, and environmental enforcement. He is known for translating technical and scientific issues into effective trial strategies and advising clients on high-stakes litigation and environmental liabilities across the United States.

Gina is a nationally recognized product liability and mass tort litigator who leads nationwide defense strategies and complex, expert driven litigation. She advises on high stakes product liability, toxic tort, and catastrophic injury matters, guiding clients from pre suit through trial and appeal. 

“Companies are facing an increasingly sophisticated and well-funded plaintiffs’ bar, expanding theories of liability, and rapidly evolving regulatory landscapes,” Davina said. “Our group provides clients with the proactive, forward-looking counsel they need to navigate emerging liabilities and anticipate shifting litigation risks. From environmental contamination and toxic torts to emerging technologies and next-generation mass litigation, we are uniquely positioned to help clients address their most significant challenges. I’m honored to lead this practice and excited to build on Mayer Brown’s strong foundation in this space.”

Michael Olsen, leader of Mayer Brown’s Litigation & Dispute Resolution practice, added: “Davina’s leadership, trial experience, and strategic judgment make her exceptionally well suited to lead this practice. Together with Chris and Gina, she will continue building one of the country’s strongest teams for product liability, mass tort, environmental, and high-stakes litigation matters.”

Mayer Brown’s Mass Torts, Product Liability & Environmental Law practice helps clients address the full spectrum of litigation, regulatory, and business challenges arising from products, chemicals, industrial operations, environmental conditions, and emerging technologies. The team advises and defends many of the world’s leading companies and regularly serves as national coordinating counsel, lead trial counsel, and strategic advisor in matters presenting significant legal, operational, and reputational exposure. The practice has extensive experience handling nationwide coordinated proceedings, multidistrict litigation, class actions, environmental enforcement actions, contamination disputes, toxic exposure claims, catastrophic injury litigation, and other high-consequence matters across a broad range of industries.

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