Ann Rossum's practice focuses on representing companies in high-stakes disputes. She has prosecuted and defended claims involving products liability, public nuisance, false claims, trade secrets misappropriation, health care, antitrust, contract disputes, and consumer protection. Ann has substantial trial and arbitration experience and is skilled in all aspects of litigation.
Ann's recent matters include defending a major retailer in multiple cases brought by states and municipalities alleging that the distribution and sale of prescription opioids constitutes a public nuisance, as well as defending a Northern California hospital system in a substantial antitrust class action alleging the system restrained competition via its contracts with insurance companies. Her recent accolades include securing a multimillion dollar jury verdict in a trade secret misappropriation lawsuit and briefing and arguing numerous successful dispositive and discovery motions, several of which were subject to and affirmed on appeal.
Ann spends significant time contributing to the community. She provides pro bono legal assistance to detained refugees through Jones Day's Border Project and serves on the Board of Directors for the Public Law Center. Ann is a member of the State Bar of California and the Orange County chapter of the Association of Business Trial Lawyers. Ann is the hiring partner for the Firm's Irvine Office.
- July 2019
Trends Emerge Under Northern District’s Class Settlement Guidelines, Daily Journal
- January 23, 2014
9th Circuit Mass Action View Remains Intact, Daily Journal
- January 26, 2022
What a Nuisance! How Traditional Products Liability Law Is Being Swallowed by an Expansive Interpretation of Public Nuisance and What Corporate Defendants Can Do About It, Jones Day MCLE University
- January 22, 2020
Recent Trends in Class Action Settlements, Jones Day MCLE University
- July 17, 2018
Data Privacy: Customer Privacy v. Customer Profiling for Marketing Purposes, Jones Day Seminar
- University of San Diego (J.D. magna cum laude 2011; Order of the Coif; Editor-in-Chief, San Diego Law Review); Scripps College (B.A. in Economics and Politics cum laude 2008)
- Recognized by Super Lawyers as a "Rising Star" for Southern California (2019-2023)
- Law Clerk (2012) and Judicial Extern (2010) to Judge Marilyn L. Huff, U.S. District Court, Southern District of California