Privacy and Data Security Law Technology Law
*Named the "Lawyer of the Year" in this practice area in the 2027 edition in Tokyo.
Hiroyuki Tanaka
Recognized in Best Lawyers since 2021 
Firm
Mori Hamada
185 Best Lawyers awards
Awarded Practice Areas
Biography
- Hiroyuki Tanaka is a Partner of Mori Hamada & Matsumoto, practicing data, IP, IT, and AI law.
- He is the Adjunct project professor at Keio University Graduate School of Law and Member of the Cyber-Physical Sustainability Center of Keio University Global Research Institute
- He has extensive experience advising foreign clients on Japanese data protection law. He is also familiar with global data protection regulations, including GDPR and CCPA / CPRA and helps Japanese clients with global data protection compliance by working closely with local counsels.
- His practice area includes legal issues relating to AI, including generative AI and the protection of cybernetic avatars.
- He has extensive experience for various IP infringement disputes as well as disputes related to IT including software and apps.
Firm
Mori Hamada
185 Best Lawyers awards
Overview
- English
- Japanese
- Gender: Male
- New York University, LL.M. in Competition, Innovation, and Information Law, graduated 2013
- Keio University Law School, J.D., graduated 2006
- Keio University, LL.B, graduated 2004
- New York, New York State Bar Association, 2014
- Japan, Dai-ni Tokyo Bar Association, 2007
- English
- Japanese
- New York, New York State Bar Association, 2014
- Japan, Dai-ni Tokyo Bar Association, 2007
- New York University, LL.M. in Competition, Innovation, and Information Law, graduated 2013
- Keio University Law School, J.D., graduated 2006
- Keio University, LL.B, graduated 2004
- Gender: Male
Client Testimonials
Awards & Focus
Named "Lawyer of the Year" by Best Lawyers® for:
- Privacy and Data Security Law, Tokyo, Japan (2027)
- Privacy and Data Security Law, Tokyo, Japan (2025)
Recognized in The Best Lawyers in Japan™ 2027 for work in:
- Privacy and Data Security Law
- Technology Law
Additional Areas of Practice:
- Intellectual Property Law
- Information Technology Law
- Telecommunications Law
- Outsourcing
- Gaming Law
- Litigation
Awards:
- Recognized as a Global Elite Thought Leader in the Data category of the Lexology Index. Also selected in the Artificial Intelligence – Transactional & Advisory and Regulatory & Compliance categories of the Lexology Index
- Named as Thomson Reuters Stand-out Lawyers - independently rated lawyers
- Recognized in IAM Patent 1000 – Japan (Litigation)
- Repeatedly recognized in the Nikkei Corporate Legal Affairs & Taxation / Attorney Survey’s ranking of outstanding lawyers (2025: Ranked 6th by corporations in the field of AI Governance; 2024: Ranked 3rd by corporations in the field of AI, Technology & Data; 2022: Selected in the Intellectual Property category; 2019: Ranked 5th by corporations in the Data-related field)
- Recognized in the AI / IT category of Bengoshi.com’s ‘Top 100 Business Lawyers Chosen by In-House Counsel and Attorneys
Additional Information
- Other Positions
- Adjunct project professor at Keio University Graduate School of Law (2023-)
- Member of the Cyber-Physical Sustainability Center of Keio University Global Research Institute (2023-)
- Advisor to Japan DPO Association (2019-)
- Chairperson of Generative AI and AI Agent Section of AI and Law Society
- Recent Major Publications
- The Global Legal Post - Data Protection Comparative Guide – Japan Chapter
- Chambers Global Practice Guides Data Protection & Privacy - Japan Chapter (Co-authored)
- Chambers Global Practice Guides Cybersecurity - Japan Chapter(Co-authored)
- The Legal 500: Artificial Intelligence Country Comparative Guide - Japan Chapter(Co-authored)
- The Technology Disputes Law Review2nd Edition (Co-edited and co-authored,2022)
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