atheria law

2023 Chambers USA Guide Ranks Atheria Law and Founding Partners Bill Casey and Joan D’Ambrosio

Atheria Law is pleased to announce that the firm and two of its founding partners Bill Casey and Joan D'Ambrosio have been ranked in the 2023 edition of the Chambers USA legal industry guide in the Insurance: Insurer in California category.

Atheria Law was founded in 2019 by a dedicated group of partners with decades of experience representing insurers and reinsurers in complex coverage matters including professional indemnity, technology, privacy, media and intellectual property claims. The firm was founded on principles of commitment, collaboration and diversity and takes great pride in this recognition from Chambers.

“We are thrilled about this recognition for Atheria Law and for Bill and Joan’s successes on behalf of our clients that have earned them rankings in the 2023 Chambers USA Guide,” said Christina Terplan, founding partner and president of Atheria Law. “We have an incredibly committed and talented team at the firm, and Bill and Joan are industry leaders who excel at helping our insurer and reinsurer clients manage the issues and exposures they face, as well as achieve their business goals.”

Ranked by Chambers since 2007, Bill focuses his practice on representing professionals, insurers and reinsurers in litigation and arbitration, particularly involving professional liability disputes worldwide of significant size and scope. He also represents lawyers and law firms in risk management and operational matters and disputes.  

Joan represents insurers in technology, media, intellectual property, privacy and professional indemnity claims. Atheria attorneys have worked on thousands of data breach incidents, and they regularly counsel insurers on all aspects of first- and third-party coverage relating to cyber and technology policies.

Chambers and Partners determines its annual rankings of leading U.S. firms and attorneys through in-depth research and interviews with law firms, clients and third parties. Chambers assesses attorneys on attributes valued by clients, including technical legal ability, professional conduct, client service, commercial astuteness, diligence, and commitment. For more information, visit

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