Eric F. Citron

Eric F. Citron is an appellate litigator with a demonstrated involvement in patent litigation, primarily representing plaintiffs. His patent litigation experience centers on software, cybersecurity, and financial technology. He has a strong background in high-stakes appellate matters, including appearances before the U.S. Supreme Court.

In his patent litigation practice, Mr. Citron has exclusively represented plaintiffs, notably serving as counsel for Intellectual Ventures, a prominent patent assertion entity, in all three of his tracked appearances. [cite: case list] His roles included arguing counsel in Intellectual Ventures I LLC v. Symantec Corp., where a jury initially awarded $17 million in damages for patent infringement related to security software. However, the Federal Circuit later invalidated the patents in that case, finding them ineligible under 35 U.S.C. § 101. He also represented Intellectual Ventures in litigation against Capital One, where patents related to banking services and internet content were at issue, leading to some patents being invalidated under § 101 and antitrust counterclaims being dismissed.

Mr. Citron was formerly with the Supreme Court and Appellate litigation boutique Goldstein & Russell, P.C., where his tracked patent cases occurred. More recently, he co-founded Zimmer, Citron & Clarke in 2025 and also serves as a managing director at Flashlight Capital Investment Partners LP, focusing on legal research and investment selection. There is no information in the available sources to suggest he regularly appears in PTAB or IPR proceedings.

Mr. Citron earned his J.D. from Yale Law School and graduated summa cum laude from Harvard College. He gained significant appellate experience through clerkships with Supreme Court Justices Elena Kagan and Sandra Day O'Connor, as well as with Judge David Tatel of the D.C. Circuit and Judge James Robertson of the D.C. District Court. He is admitted to practice in the District of Columbia and Maryland.