Mr Atsushi Okada > Mori Hamada & Matsumoto > Tokyo, Japan > Lawyer Profile

Mori Hamada & Matsumoto
TOKYO 100-8222

Work Department

Intellectual Property, TMT, Data Protection, Fintech, Life Sciences, AI/IoT and Product Liability




Atsushi Okada is co-head of the firm’s IP, Data Security, Fintech, Healthcare and AI/IoT practice groups and regularly advises on cutting edge technology issues across industries.

He focuses on international and domestic infringement litigation, licensing, data protection, product liability disputes, cyber security, M&A, and other IP/IT related transactions in a broad range of technical fields (including pharmaceuticals, software, machinery, semiconductors and medical equipment). He is also an expert in privacy and global compliance with data protection laws in Japan, Europe, the U.S. and other Asian countries.

His extensive writings include, “Patent Litigation” (Thomson Reuters, 2022), “The Financial Technology Law Review [5th ed.]” (Law Business Research Ltd, 2022), “Overview of Amended APPI” (Data Protection Leader, 2022), “Q&A: Digital Health and Law [2nd ed.]” (Shojihomu Co., Ltd., 2022),  “Legal Affairs for Platform Businesses [2nd ed.]” (Shojihomu Co., Ltd., 2022), “Drone Business and Regulations [2nd ed.]” (Seibunsha Co., Ltd., 2022) and “The Pharmaceutical Intellectual Property and Competition Law Review [2nd ed.]” (Law Business Research Ltd, 2021).




Daini-Tokyo Bar Association (2002), New York State Bar Association (2008)

He also serves as a member of various governmental committees, including the Study Group on AI/Data Contract Guidelines (METI), AI Governance Guideline Working Group (METI), Review Meeting for Smart City Architecture (Cabinet Office) and Board of Examiners at Industrial Property Council (Japan Patent Office).


  • The University of Tokyo (LL.B., 2001)
  • Harvard Law School (LL.M., 2007)
  • with Weil, Gotshal & Manges LLP, Silicon Valley (2007-2008)

Lawyer Rankings

Japan > TMT: Independent local firms

(Leading individuals: Bengoshi)

Atsushi Okada – Mori Hamada & Matsumoto

Mori Hamada & Matsumoto fields a team with significant experience in litigation, transactions, and regulatory matters. Areas of strength for the department include telecommunication law, technology transfer agreements, and development agreements. Hiromi Hayashi, Atsushi Okada, and Koichiro Iida jointly lead the practice. Hayashi has expertise in telecommunications matters and cybersecurity, Okada covers data protection, AI, and digital health regulations, and Iida handles litigation matters and business regulation. Norihito Sato is also key, and is recognised as an expert in automated vehicles.

Japan > Intellectual property: Independent local firms

(Leading individuals: Bengoshi)

Atsushi OkadaMori Hamada & Matsumoto

Mori Hamada & Matsumoto‘s well regarded intellectual property team covers all relevant areas of intellectual property, with significant experience in infringement cases involving patents, design patents, trademarks and copyrights, invalidation trials, appeals, and employee interventions. The department represents both domestic and multinational clients, and has the depth to support these both globally and before the highest Japanese courts. Yutaka Miyoshi, who has broad disputes expertise across patent litigation, copyright litigation, and trade secret litigation, co-leads the department alongside Yoshifumi Onodera, who is experienced in both domestic and international dipute resolution and arbitration, particularly across China and other Asian countries. Also co-leading is Atsushi Okada, who covers IP infringement litigation, IP transactions and data protection. Associate Hideaki Kuwahara is also noted.

Japan > Fintech - Independent local firms

Mori Hamada & Matsumoto has considerable expertise across technology, financial services regulatory law and intellectual property, and brings this to a range of high profile domestic and international clients, including traditional players, disruptors, collaborators and start-ups. The team contains multiple practitioners with prior experience working within regulatory and governmental bodies and as such boasts strong relationships with and insights into these organisations. Co-leading the department are Masakazu Masujima, whose practice includes crypto-assets, crowdfunding and insurtech, Takane Hori, who handles data protection and cybersecurity, and Atsushi Okada, whose broad expertise includes payment services, cybersecurity and data protection. Kei Furuichi  has left the firm.