Adam Le Berthon Partner




Adam Le Berthon is a trial lawyer with nearly 25 years of experience in complex and multiparty business and entertainment litigation. He has extensive experience defending product liability and mass tort actions filed against pharmaceutical and consumer products companies, and he has represented numerous companies and individuals involved in environmental litigation. Adam also has experience structuring and negotiating the settlement of both individual and large groups of related cases.

The work Adam has done provided him with a broad range of experience in many different courts, handling both individual and class action cases. He regularly works with local counsel in other states and has appeared in state and federal court in numerous jurisdictions. He has appeared before the federal Judicial Panel on Multidistrict Litigation, in MDL cases in federal courts and in coordinated proceedings in state courts. Adam has been selected to serve as lead counsel and liaison counsel in a federal MDL proceeding, and has appeared in bankruptcy court in both the Central and Southern districts of California. Adam’s experience has provided him with a broad scientific, medical and environmental background, as many of the cases he has handled involve issues relating to mass spectrometry, cardiology, pulmonology, nephrology, epidemiology, pharmacology, geology, hydrogeology, and other specialized and technical fields of study.

Areas of Focus

Commercial & Business Litigation
Adam represents both plaintiffs and defendants in a wide variety of complex litigation cases involving claims relating to breach of contract, fraud, unfair business practices, real estate and construction defect disputes, and various business tort claims.

Product Liability
Adam represents clients who manufacture and distribute consumer and pharmaceutical products in lawsuits in which the plaintiffs contend the products were defective.

Adam has handled numerous cases involving soil and groundwater contamination, including claims asserted under the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and the Resource Conservation and Recovery Act (RCRA).

Representative Matters

Commercial & Business Litigation

Representation of parties in litigation involving sale of commercial real property and alleged construction defects. 

Representation of motion picture production company in contract dispute with another motion picture production company.

Representation of national accounting firm in action involving claims of negligence and fraud.

Representation of international motion picture actress in defamation lawsuit against Internet news portal.

Representation of banks and insurance companies in actions to collect amounts due under terms of loans and guarantee agreements.

Representation of parties in actions involving alleged breach of contract and unfair business practices. 

Product Liability/Mass Torts

Representation of pharmaceutical company in nationwide Fen-Phen litigation.

Representation of manufacturer of heparin in nationwide litigation in which plaintiffs alleged the product was contaminated with a hazardous substance.

Representation of nutritional supplement distributer in action alleging its products contained manufacturing defects.

Representation of major tobacco company in smoking and health lawsuits.

Primary settlement negotiator for pharmaceutical company in Fen-Phen diet drug litigation.


Representation of major oil companies and petroleum retailers in lawsuits involving alleged soil and groundwater contamination and alleged violation of environmental regulations.

Representation of property owners and lessees in actions under the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and the Resource Conservation and Recovery Act (RCRA).

Representation of property owners and lessees in sale and lease transactions involving contaminated real property.