Jonathan Herstoff

Jonathan Herstoff’s client advocacy is results driven—leveraging experience to achieve success. His unique skills in taking complex matters apart to get to the core of the argument, combined with exceptional technical expertise, deliver beneficial outcomes before courts and agencies ranging from the highest, the U.S. Supreme Court, to the specialized, including the International Trade Commission and the U.S. Patent and Trademark Office. Cited as a “Legal Lion” by Law360, Herstoff’s legal expertise and focused approach makes a difference for his clients.

Jonathan Herstoff focuses on patent litigation, analysis of complex evidentiary and procedural rules, appellate litigation, preparation of briefs, and preparation of witnesses for trial. As an attorney at Haug Partners, Herstoff represents a variety of clients, including major pharmaceutical companies who benefit from Herstoff’s expertise in Hatch-Waxman patent litigation. He is distinctive for twice having presented oral argument before the United States Supreme Court, as well as having been involved with eight trials and numerous appeals since joining Haug Partners in 2011.

Herstoff’s first U.S. Supreme Court argument in Hamer v. Neighborhood Housing Services of Chicago, 138 S. Ct. 13 (2017) resulted in a unanimous decision in favor of his client and earned him designation as a “Legal Lion” by Law 360. In addition to his multiple cases before the U.S. Supreme Court, Herstoff has also represented clients before the U.S. Court of Appeals for the Federal Circuit, the U.S. Court of Appeals for the Seventh Circuit, the U.S. Court of Appeals for the Second Circuit, the U.S. Court of Appeals for the Ninth Circuit, multiple U.S. District Courts, the U.S. International Trade Commission, and the U.S. Patent and Trademark Office.

Jonathan Herstoff’s education included a clerkship with Judge Arthur Gajarsa of the U.S Court of Appeals for the Federal Circuit; an internship at the U.S. International Trade Commission; a Juris Doctor degree magna cum laude, and an L.L.M degree in Intellectual Property from the Franklin Pierce Law Center (now the University of New Hampshire School of Law); and the study of intellectual-property law in Beijing at the Tsinghua University Law School. Herstoff graduated cum laude with a Bachelor of Science in chemistry from Muhlenberg College. While an undergraduate, Herstoff pursued numerous chemistry and physics research projects, including interning at Brookhaven National Laboratory with the Pioneering High Efficiency Nuclear Interaction Experiment (PHENIX) Laboratory. Herstoff’s background in the sciences has prepared him for complex work in patent litigation.