Jonathan S. Kagan

Jonathan S. Kagan is a highly experienced patent litigator and partner at Irell & Manella LLP, focusing on complex intellectual property disputes. His practice primarily involves representing clients in the electronics sector, including semiconductors, internet infrastructure, and cybersecurity, as evidenced by his involvement in cases concerning malware detection and network security patents.

Kagan predominantly represents defendants, consistently securing favorable outcomes for operating companies facing patent infringement allegations. His notable defense victories include successfully defending Juniper Networks against Finjan Inc. in cybersecurity patent litigation, resulting in a jury finding of non-infringement and an award of $5.9 million in attorneys' fees for Juniper, affirmed by the Federal Circuit. He also served as trial counsel for ASML in a semiconductor manufacturing equipment patent case, where a jury found the plaintiff's patent invalid, a verdict affirmed by the Federal Circuit and recognized as a top defense verdict. Additionally, he secured a $175 million settlement for Juniper Networks in a patent dispute with Palo Alto Networks. The attorney's tracked appearances confirm a defense-side focus, with one recorded appearance for a defendant, namely in Sampo IP, LLC v. Juniper Networks, Inc. where he served as lead counsel.

He possesses extensive experience in post-grant proceedings, including leading teams and coordinating inter partes reviews (IPR) before the Patent Trial and Appeal Board (PTAB).

Jonathan S. Kagan earned his J.D. from the University of California Los Angeles (UCLA) School of Law in 1993 and has been licensed to practice in California since the same year.