He focuses on complex litigation, with a particular emphasis on matters concerning high technology. His practice primarily includes intellectual property matters concerning patents, copyrights and trademarks; antitrust matters; and litigation surrounding complex financial instruments and related accounting treatment. He has practiced in state and federal courts in California and across the country.

Before founding Warren Lex LLP, Mr. Warren worked at some of the best large law firms in the country, including Quinn Emanuel Urquhart & Sullivan, Sullivan & Cromwell, and Davis Polk & Wardwell. As a partner at Quinn Emanuel, Mr. Warren was central to some of the biggest battles in modern litigation, including the smartphone wars between Apple and Android, and litigation between Qualcomm and Nokia. His representative clients include Google, HTC, Samsung and Motorola, as well as Seiko Epson, Konica Minolta and AIG. At Warren Lex LLP, Mr. Warren offers his top experience and talent without the overhead and expense of a large law firm.

Notable Representations

Represented Google against allegations of patent infringement by Rockstar Consortium in the Northern District of California and the Eastern District of Texas, reaching settlement soon after Mr. Warren and his team scored a significant victory before the Court of Appeals for the Federal Circuit, forcing Rockstar to proceed in the Northern District of California, rather than its preferred jurisdiction, the Eastern District of Texas. The Court of Appeals decision was widely hailed as an important victory for Google and the other defendants, and, shortly after this ruling, Rockstar abandoned its attempts to license its patents, sold them, and disbanded.

Represented Google and Samsung against assertions by Apple of patent infringement in the Northern District of California. Mr. Warren was responsible for four of the eight patents Apple asserted against Samsung; on those four patents, Apple recovered nothing. Apple dropped two of these patents after unfavorable claim construction rulings. Apple took the other two patents to trial, but the jury found no infringement of either patent.

Represented Google and Motorola before the Federal Trade Commission regarding its investigation into Googles $12.5 billion acquisition of Motorola, resulting in a consent decree, and receiving for this representation Global Competition Reviews Matter of the Year award.

Represented Google, Motorola, Samsung and HTC in litigation before the Eastern District of Texas regarding allegations of patent infringement by the Dalvik virtual machine. Obtained summary judgment of non-infringement of all claims, which the Court of Appeals affirmed.