Ann Rossum's practice focuses on commercial litigation, with an emphasis in class action defense. She has prosecuted and defended claims involving cybersecurity and data protection, consumer fraud and false advertising, trade secrets misappropriation, health care, antitrust, contract disputes, and consumer protection. Ann is experienced in all aspects of litigation, including trial and appeals.
Ann's recent experience includes obtaining multiple pleading stage dismissals of putative nationwide class actions arising in a range of legal contexts. She has also achieved complete victories on summary judgment that were affirmed on appeal. In another recent matter, Ann secured a multimillion dollar jury verdict, including punitive damages, on behalf of an employer asserting misappropriation of trade secrets claims.
Ann devotes significant time to pro bono work through Jones Day's Border Project, which provides assistance to detained refugees. Ann has published and spoken on a range of class action topics, including class settlement and certification. She is also a member of the State Bar of California, the Association of Business Trial Lawyers, and the Orange County Bar Association.
Before joining Jones Day, Ann clerked for the Honorable Marilyn L. Huff in the United States District Court for the Southern District of California.
- 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 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)
- Law Clerk at the United States Attorney's Office, Southern District of California (2009); Field Representative for California Assemblywoman Lynn Daucher (2005-2006)
- Recognized by Super Lawyers in 2019, 2020, and 2021 as a class action/mass torts "Rising Star" for Southern California
- Law Clerk (2012) and Judicial Extern (2010) to Judge Marilyn L. Huff, U.S. District Court, Southern District of California