Warren has helped build Keller Postman’s arbitration practice, which devotes unparalleled resources to resolving the claims of consumers and employees who are subject to forced arbitration clauses. The firm’s commitment to arbitration allows it to aggressively pursue individual arbitrations for tens of thousands of clients simultaneously and, as described by the New York Times, has left defendants “scared to death.” Warren has won numerous precedent-setting victories requiring defendants to comply with their obligation to arbitrate under agreements they drafted.
Due in large part to the arbitration practice Warren has built at Keller Postman, the rise of “mass arbitrations” has been one of the most significant recent developments in civil litigation. In the last two years alone, Keller Postman has secured millions in settlements for more than 500,000 individual clients.
Before joining Keller Postman, Warren was Vice President and Chief Counsel for Appellate Litigation at the U.S. Chamber Litigation Center. In that role, he managed appellate strategy for the U.S. Chamber of Commerce, which participates in more than 150 cases each year to shape the law on a wide range of issues affecting businesses. Working closely with senior in-house lawyers at some of the world’s largest companies, Warren gained unique insight into the dynamics and trends that shape business litigation.
Warren was previously an attorney in the Issues & Appeals practice at Jones Day, where he helped guide trial and appellate strategy in some of the firm’s most complex and high-stakes cases.
Warren served as a law clerk for Justice David H. Souter at the Supreme Court of the United States and Judge William A. Fletcher at the U.S. Court of Appeals for the Ninth Circuit. He graduated magna cum laude from Harvard Law School, where he was Articles Editor on the Harvard Law Review, and graduated magna cum laude and Phi Beta Kappa from Brandeis University.
Warren was named Law360’s 2022 Technology MVP for leading one of Keller Postman’s largest mass arbitration litigation efforts against Amazon—and for his work to spearhead operational and technological efficiencies for mass claims litigation. He was named Law360’s 2021 Employment MVP for his work to represent hundreds of thousands of gig economy workers in arbitration. He was also named a 2021 Plaintiffs’ Lawyers Trailblazer by the National Law Journal and is ranked as Band 1 by Chambers and Partners in the District of Columbia. Warren is listed on Lawdragon’s 500 Leading Lawyers in America, Lawdragon’s 500 Leading Plaintiff Financial Lawyers, the National Trial Lawyers’ Top 100, and District of Columbia Super Lawyers.
Warren is licensed to practice law in California and the District of Columbia only.