Yardena R. Zwang-Weissman
Yardena Zwang-Weissman advocates for clients facing complex and high-stakes issues in environmental, mass tort, and product liability litigation across a variety of industries such as manufacturing and supply, energy, technology, life sciences, consumer products, and pharmaceutical and medical device, among others. She partners with clients from the infancy of matters through trial to navigate the nuances of individual, mass, serial, and class action cases in complex courts, coordinated proceedings, and in multidistrict litigation (MDL), often involving many parties, brought by numerous private and government plaintiffs, and involving regulatory and other multifaceted considerations.
As the deputy leader of the global litigation practice, Yardena helps to set the strategy and supports the operational goals of the practice.
A leader of Morgan Lewis’s crisis management team and thought leader on the strategy and practice of legal crisis management, Yardena draws upon her own experience and the resources of the firm to guide clients through high-profile disputes, where strategic coordination, development and implementation of overarching strategy across teams, and management of the multiple components of crisis-driven litigation is essential to the defense. Yardena represents clients in emergent incident cases and in matters involving the highest degree of sensitivity for the client’s reputational interests. Whether representing clients in individual matters or mass proceedings, she collaborates to develop litigation-wide strategy to address matters involving novel and fast developing issues related to science, medicine, technology, and the environment.
Among her key representations, Yardena has been responsible for national case coordination, strategy, and litigation leadership defending many large, complex matters often involving various products, services, as well as alleged air, soil, water, and groundwater contamination across jurisdictions, including those in which she served in critical roles on trial teams. She represents clients in cases involving various substances such as volatile organic compounds (VOCs), perchlorate, polychlorinated biphenyl (PCB), dioxin, furan, per- and polyfluoroalkyl substances (PFAS), lead, asbestos, benzene, talc, and silica.
While in law school, Yardena served as an extern for Justice Carlos Moreno of the Supreme Court of California and Judge S. James Otero of the Central District of California. She also served as the notes editor for the Hastings Law Journal.
- Served as coordinating and litigation counsel for Sempra Energy and Southern California Gas Company in litigation and regulatory matters involving the Aliso Canyon gas leak in Porter Ranch, California.
- Represents clients in litigation and other matters related to allegations involving exposure to PFAS.
- Secured summary adjudication of various causes of action and then prevailed at trial on remaining claims related to alleged groundwater contamination on behalf of a global manufacturer.
- Represented a leading paper manufacturer in a jury trial regarding multi-billion dollar environmental dispute with a local government that resulted in a defense verdict.
- Secured dismissal of a federal nationwide class action at the pleading stage for a financial services institution involving allegations of unfair competition and fraud.
- Successfully resolved an environmental matter regarding alleged groundwater contamination and cost recovery claims during trial.
- Successfully resolved environmental matters regarding alleged soil and air contamination on behalf of multiple clients prior to trial.
- Managed discovery and trial preparation in the representation of a manufacturer and supplier in hundreds of product liability cases, including developing defenses, working with fact and expert witnesses, and taking dozens of depositions.
- University of California, Hastings College of the Law, 2006, J.D.
- University of California, Santa Barbara, 2003, B.A., with highest honors
- California
- US District Court for the Northern District of California
- US District Court for the Eastern District of California
- US District Court for the Central District of California
- US District Court for the Southern District of California
Leading Partner, Dispute resolution: Product liability, mass tort and class action: toxic tort - defense, The Legal 500 US (2025)
Next Generation Partner, Dispute resolution: Product liability, mass tort and class action: toxic tort - defense, The Legal 500 US (2021–2024)
Recommended, Dispute resolution: Product liability, mass tort and class action: pharmaceuticals and medical devices - defense, The Legal 500 US (2018–2020, 2023, 2024)
Recommended, Dispute resolution: Product liability, mass tort and class action: toxic tort - defense, The Legal 500 US (2018–2022)
Recommended, Industry focus: Insurance: advice to policyholders, The Legal 500 US (2018)
Recommended, The Legal 500 US (2016, 2017)
Leaders of Influence, Litigators & Trial Attorneys, Los Angeles Business Journal (2024)
Recognized, Leaders in Environmental Law, Environmental Litigation, Lawdragon Green 500 (2023–2025)
Listed, The Best Lawyers in America, Litigation - Environmental, Los Angeles (2022–2026)
They’ve Got Next, Environmental Law, Bloomberg Law (2021)
Rising Star, Environmental, Law360 (2018)
Rising Star, Southern California Super Lawyers (2013–2017)
Member, Executive Committee, Environmental Section of the Los Angeles County Bar Association (2011–present)
Member, American Bar Association
