About Leslie Payne
For over 30 years, Leslie Payne has focused on high-stakes patent infringement cases while representing plaintiffs and defendants at both the trial and appellate levels. His legal background also includes numerous cases involving trade secret misappropriation, unfair competition, trademark infringement, breach of contract claims, and other areas related to intellectual property. Les co-founded Heim, Payne & Chorush in 2006.
He was recognized in 2023 by IAM Patent 1000 – The World’s Leading Patent Professionals, which said he “is an incredible advocate who gets results. He is very aggressive and straight-forward in his approach; he identifies the issues that really matter and devises creative solutions to solve them. Leslie excels at all aspects of litigation but particularly shines on the technical side.”
Les serves as lead and co-lead counsel in his cases throughout the country, from initial filings through trying cases to verdicts and handling subsequent appeals before the U.S. Court of Appeals for the Federal Circuit and U.S. Supreme Court.
Les has represented clients in various engineering and science disciplines, including the mechanical, electrical, computer, and chemical arts. On the plaintiff’s side, Les has helped clients win numerous verdicts and settlements totaling well over a billion dollars. In addition, his defense clients have won multiple dismissals without any payment to plaintiffs. Please see the Representative Cases header below for more examples of Les’ work for clients.
In addition to his courtroom representation of plaintiffs and defendants, Les has an active inter partes review practice before the U.S. Patent Trial and Appeal Board (“PTAB”). On behalf of patent-owner clients, he has successfully convinced the PTAB to uphold the validity of many contested patents. These successes have allowed clients to continue pursuing the enforcement of their patents in litigation against infringers. Les also has helped those accused of patent infringement successfully invalidate many patents at the PTAB, which has resulted in the dismissal of the related lawsuits.
Les has earned professional honors from numerous legal organizations, including Chambers USA, The Best Lawyers in America, and Texas Super Lawyers, among others. These honors demonstrate that he has been consistently recognized as a leading litigation attorney in the intellectual property field.