Kirkland & Ellis LLP

Nathan Mammen’s practice focuses on intellectual property trial and appellate litigation. He frequently represents clients and leads teams in “bet-the-company” complex intellectual property matters. He has experience in diverse technologies such as medical devices, radio-frequency identification, wireless communication, semiconductors, bio-technology and pharmaceuticals, and mechanical devices. Nathan is often sought for creative thinking and clear briefing.

He has successfully represented clients in numerous proceedings before the Patent Trial and Appeal Board, district courts, and the International Trade Commission, and international arbitrations. He also has extensive appellate experience and frequently represents clients in appeals before the U.S. Court of Appeals for the Federal Circuit. He is an experienced oral advocate who has argued before various state and federal appellate courts.

Nathan is frequently consulted about matters before the PTAB and U.S. Patent and Trademark Office. He worked as a patent examiner before and during law school.

Nathan is passionate about giving back through pro bono service, and he frequently represents his fellow veterans seeking benefits, including regularly handling appeals before the U.S. Court of Appeals for the Federal Circuit and bringing attention to systemic legal issues affecting veterans.

Prior to joining Kirkland, Nathan was a law clerk to Chief Judge Karen J. Williams, U.S. Court of Appeals for the Fourth Circuit. Nathan is a veteran of the U.S. Army. He served as appellate counsel in dozens of military criminal cases. In 2012-2013, Nathan volunteered for active duty in support of Operation Enduring Freedom and served as a military prosecutor in Kuwait.