While in private practice, Sonja Sonnenburg represented individuals and corporate clients in general and complex litigation in state and federal courts throughout California. She handled a variety of civil litigation matters involving antitrust and trade regulation, unfair competition, business torts, breach of contract, intellectual property, employment, constitutional law, and commercial speech.

Sonja currently serves as a hearing officer for the California Labor Commissioner’s Office.

In 2014, Sonja served as the Chair of the Committee on Administration of Justice of the State Bar of California.  This standing committee studies and reports recommendations on proposed changes in civil procedure, court rules and administration, rules of evidence, and other matters having an impact on the administration of justice in civil courts.

Sonja co-authored the Unfair Practices Act chapter in the legal treatise California Antitrust and Unfair Competition (Matthew Bender, 2009).  While a research assistant in law school, she provided updates for Art and Museum Law: Cases and Materials (Carolina Academic Press, 2002); Newsgathering and the Law (2d. ed., Matthew Bender, 1999); and Entertainment Law: Legal Concepts and Business Practices (West Group, 1998).

Sonja is admitted to practice law in the California state courts, all of the federal U.S. District Courts in California and the U.S. Court of Appeals for the Ninth Circuit.  She is a member of the Bar Association of San Francisco and the San Francisco La Raza Lawyers Association.  She is a certified mediator.

She received a law degree from Southwestern Law School, where she was awarded a CALI Excellence for the Future Award for an antitrust and intellectual property course taught by leading antitrust authority Lawrence Sullivan.  While in law school, she interned at the Federal Trade Commission, Los Angeles Regional Office.