Lieff Cabraser Heimann & Bernstein

Lieff Cabraser Heimann & Bernstein, LLP is a prominent plaintiffs' law firm headquartered in San Francisco, with additional offices in New York, Nashville, and Munich. The firm operates as one of the largest in the United States exclusively representing plaintiffs, with an attorney roster of over 100 professionals. Recognized by The American Lawyer as "one of the nation's premier plaintiffs' firms," Lieff Cabraser has also been named "Boutique Litigation Firm of the Year" by The American Lawyer in 2021 and is a member of the National Law Journal's Plaintiffs' Hot List Hall of Fame. Chambers USA consistently ranks the firm in "Litigation: Mainly Plaintiffs" and "Antitrust: Mainly Plaintiff" categories.

The firm's intellectual property litigation practice focuses on safeguarding the rights of patent and copyright holders. Lieff Cabraser notably represents plaintiffs, aligning with its firm-wide commitment to plaintiff-side litigation. Their experience includes roles such as local counsel for plaintiffs in patent disputes, exemplified by their appearance in Apple Inc. v. HBCU Messaging US LP. The firm has recently demonstrated a significant focus on emerging technology areas, particularly in copyright litigation related to artificial intelligence.

A key highlight of Lieff Cabraser's IP practice is its role as co-lead class counsel in Bartz et al. v. Anthropic PBC, a landmark copyright infringement class action against AI company Anthropic. This case involved a proposed $1.5 billion settlement concerning the alleged exploitation of copyrighted books by AI models. More broadly, the firm has achieved substantial results for clients across various class actions, recovering over $133 billion in verdicts and settlements, including numerous cases valued at $1 billion or more. While actively engaged in complex litigation, there is no publicly prominent or extensively documented practice area within the firm specifically dedicated to Patent Trial and Appeal Board (PTAB) or Inter Partes Review (IPR) proceedings.

Key partners in the firm's IP litigation capabilities include Patrick J. Conroy, whose practice concentrates on patent infringement, trade secret, and technology-based claims, with extensive trial experience in federal courts and the International Trade Commission. Eric B. Fastiff is also noted for his leadership in the firm's Antitrust, Intellectual Property, and Commercial Litigation practice groups.