Sterne Kessler Building Interior

Jean Paul "Yugo" Nagashima



Yugo Nagashima

Jean Paul “Yugo” Nagashima is a counsel in Sterne Kessler’s Trial & Appellate Practice Group. Yugo has litigated complex commercial cases both in Japan and in the United States, primarily in the area of patent infringement litigation. This involved representing Japanese clients in a Section 337 investigation before the U.S. International Trade Commission, and representing both American and Japanese clients before the Federal District Courts. He has represented numerous Japanese companies in patent litigation in the United States.

Yugo has litigated patents on a wide variety of technologies, including multifunction printers, aseptic packaging systems, LCD flat-panel displays, television system-on-chip technology, and video compression technology.

In Japan, Yugo practiced as a Bengoshi (Japanese attorney) litigating intellectual property matters before the Tokyo District Court and Tokyo High Court. Yugo also represented Japanese clients on matters involving intellectual property license agreements including patent and trademark license agreements. Yugo has also advised clients on international mergers and acquisitions involving acquisitions of tech companies.

Prior to working as an attorney, Yugo served as a law clerk to the Honorable Kent A. Jordan on the United States Court of Appeals for the Third Circuit. Yugo also served as a legal apprentice in the Sapporo District Court jurisdiction for the 2008-2009 term (62 Ki Shihō Shūshusei). After passing the Japanese bar (Shiho-Shiken) in 2008.

Yugo received his J.D. from Keio University Law School in Tokyo, Japan. He received his Master of Laws (LL.M.) with a Law & Technology Certificate from the University of California, Berkeley School of Law and a B.S., magna cum laude, from Georgetown University.

Yugo is a member of the bars of New York, District of Columbia and Japan, and is admitted to practice before the United States Court of Appeals for the Third Circuit, the United States District Court for the District of Delaware, and Japanese Courts, among others.

Thought Leadership

Contact Information

Phone Number


Keio University Law School
University of California Berkeley School of Law
Legal Apprentice
Legal Research and Training Institute of the Supreme Court of Japan
Science Technology and International Affairs
Georgetown University - Walsh School of Foreign Service
magna cum laude
Certified Information Privacy Professional/United States
International Association of Privacy Professionals
Certified Information Privacy Manager
International Association of Privacy Professionals


District of Columbia
New York
U.S. Court of Appeals for the Third Circuit
U.S. District Court for the District of Delaware


  • Daiichi Tokyo Bar Association


  • U.S. Court of Appeals for the Third Circuit

Languages Spoken

Chinese (Mandarin)