J. Warren Rissier
J. Warren Rissier counsels on defense of class actions and other complex commercial litigation, with emphasis on consumer actions, securities, professional liability, and real estate disputes. Warren successfully represents individual and corporate clients in proceedings in California courts and other jurisdictions across the country, as well as in arbitrations and government investigations. Warren leads the firm’s litigation Mass Arbitration Working Group. He is also the managing partner of the firm’s Los Angeles office.
Warren is listed in The Best Lawyers in America for commercial and securities litigation and is co-author of Class/Collective Actions in the United States, published by Practical Law. Warren is a past president of the Los Angeles Chapter of the Association of Business Trial Lawyers and served on its Board of Governors for nine years (2006–2014).
Class Action Defense
- Defended global Internet retailer in consumer class action alleging claims of false advertising, unfair competition and violation of the Consumer Legal Remedies Act, resulting in dismissal of all claims on summary judgment
- Defended real estate management company in consumer class action alleging claims of fraud, unfair competition and violation of Civil Code regarding security deposits, resulting in denial of class certification
- Defended energy company in securities class action resulting in dismissal on the pleadings for failure to allege scienter
- Defended global real estate company in securities class actions alleging claims of fraud and unfair competition resulting in dismissal on the pleadings on statute of limitations grounds
- Defended global chemical manufacturer in putative antitrust consumer class action, resulting in denial of class certification
- Defended clothing retailer in defense of Fair Credit Reporting Act class action resulting in favorable settlement
- Defended special committee to board of directors in shareholder class actions against provider of voice and data communications solutions, defeating attempts by shareholders to enjoin the company’s merger with another public company
- Defended special committee to board of directors in shareholder class actions against leading music retailer, defeating attempts by shareholders to enjoin acquisition of the public company in a going-private transaction
- Defended leader in wireless networks technology in securities class action, resulting in favorable settlement after first day of trial
- Defended aeronautics manufacturer in defense of toxic tort class action, resulting in dismissal of a majority of plaintiffs on summary judgment
Mass Arbitration Defense
- Defending technology company against mass arbitration
- Defending video game company against mass arbitration
- Defended technology company in mass arbitrations, resulting in dismissal of some claims and favorable individual settlements of the remainder
- Defended technology company in mass arbitrations, resulting in favorable class settlement
Accountant Defense
- Defended major accounting firm in securities class action resulting in dismissal on the pleadings for failure to allege scienter
- Defended major accounting firm in securities class action arising from financial crisis resulting in significant narrowing of the class and favorable settlement after filing of summary judgment motion
- Defended major accounting firm in civil litigation brought by investors in alleged tax shelters
- Defended major accounting firm in government investigations resulting in no action
- Defended major accounting firm in bankruptcy trustee investigation resulting in no action
- Represented major accounting firm in defense of breach of contract claims resulting in dismissal on the pleadings
- 1998年 University of Southern California Law School (J.D.)
- 1992年 Arizona State University (B.S. Marketing)
- California
- US Court of Appeals for the Ninth Circuit
- カリフォルニア州中央地区連邦地方裁判所
- 米国カリフォルニア州南部地区地方裁判所
- 1997年 Extern, カリフォルニア州中央地区連邦地方裁判所, Judge Consuelo B. Marshall


Listed, The Best Lawyers in America, Commercial Litigation, Los Angeles (2023–2026)
Listed, The Best Lawyers in America, Litigation – Securities, Los Angeles (2016–2026)
Recommended, Dispute resolution: Appellate, The Legal 500 US (2019)
Member, Law Firm of the Year, Securities Regulation, US News/Best Lawyers – Best Law Firms (2019)
Recognized, Securities Litigation and Class Action & Mass Torts, Southern California Super Lawyers (2011–2019)
Top 20 California Lawyers Under 40, Los Angeles and San Francisco Daily Journal (2010)
Super Lawyers, Southern California Rising Star, Law & Politics and Los Angeles Magazine (2006–2010)
Member, Order of the Coif, University of Southern California Law School (1998)
Merit Scholarship, University of Southern California Law School (1998)
Southern California Law Review, University of Southern California (1997)
Community Service
President, Board of Directors, Heart of Los Angeles Youth (2014–2016), Audit Committee Chair (2011–2013), Board Executive Committee (2017-present), and Board member (2006–present)