William Um

UC Regent 2018-2019

Board Member, UCI Alumni AssociationWilliam Um

Counsel, Hunton & Williams


UC Irvine – 1990, B.A., social sciences

Boston University  – 1993, J.D.


William Um is Counsel with the law firm Hunton & Williams. He is a nationally known litigator focusing on complex business litigation, insurance coverage advice and related coverage litigation.

Um advises and represents corporate policyholders in complex insurance coverage claims relating to a variety of matters, including class actions, media liability, intellectual property disputes, data breach and privacy issues, directors and officers liability, and various environmental and toxic tort matters. He also has handled general business litigation matters involving complex commercial contracts, fraud and misrepresentation claims, and unfair competition and unfair business practices.

Um has extensive experience in major, multiparty complex litigation matters in both state and federal courts, and is admitted to practice before the United States Court of Appeals for the Ninth Circuit and the United States District Court for the Central District of California. In addition to trial work, Um also has served as lead counsel in arbitration proceedings across the country and secured numerous multi-million dollar arbitration awards, including one of the largest defense fee arbitration awards in California history.

Over the course of his career, Um has assisted clients in recovering hundreds of millions of dollars in various types of insurance matters. His clients have included companies specializing in technology, entertainment, aerospace, professional services, manufacturing, and oil and gas production.

Um maintains an active pro bono practice. He has assisted the Alliance for Children's Rights in adoption proceedings and handled several matters for indigent clients through Public Counsel and the Public Law Center. Among other organizations, Um is a member of the Association of Business Trial Lawyers, American Bar Association - Litigation Section, as well as the California and Los Angeles County Bar Associations.