All paintings by Arthur Williams (11/12 years old)

Ken Masuyama

Registered Foreign Lawyer (Japan)

T:+852 2363 2370

F:+852 2363 8296

Practice Areas


Japan 2015

Ken was admitted as an attorney-at-law in Japan in 2015 and newly registered as a foreign lawyer in Hong Kong.

Ken had earned his law degrees (LL.B and J.D) from Kyoto University and after working as a lawyer for a few years in Japan, he was awarded an LL.M in International Economic Law from the Chinese University of Hong Kong in 2020.

Prior to joining Wellington Legal, Ken worked in Yodoyabashi & Yamagami LPC, one of the big-four law firms in Osaka. He has wide experience in all aspects of corporate and commercial matters, including merger & acquisition, regulatory and compliance, real estate, tort and dispute resolution.

In particular he has specialised in the area of intellectual property law and has represented in a variety of complex litigations, trials and mediations in relation to patent, copyright, and design right infringement cases. He was appointed as a lecturer of intellectual property law in Kyoto Sangyo University in academic year of 2018/19. His practicing experience also covers legal issues arising from sports and entertainment area.

With broad knowledge and experience in general corporate matters and specialised insight in intellectual property law, Ken has advised not only listed companies and top-tier companies but also start-ups and SMEs in Japan from holistic perspective.

Ken is fluent in Japanese and English.


  • LLM Representative, the Graduate Law Student Association at the Chinese University of Hong Kong 2019/20
  • Lecturer, Kyoto Sangyo University 2018/19
  • Member, the Copyright Law Association of Japan 2018
  • Contributing author for the annual journal “Copyright Law Research of Japan” 2020
  • Arbitrator and Mediator, the Japan Sports Arbitration Agency 2017
  • Member, the Sports and Entertainment Law Association of Osaka Bar Association 2016
  • Contributing author for the textbook “Questions and Answers of Legal Matters Concerning Sports, 4th Edition” 2018
  • Member, Inter Pacific Bar Association (IPBA) 2016

Representations and Work Highlights

  • Advising a Japanese entertainment agency in strategic development and management of its intellectual property rights including copyrights, neighbouring rights on copyright, publicity rights and license agreement with a broadcaster
  • Advising a listed advertisement agency in Japan in copyright issues arising from its advertisement work
  • Representing a Japanese importer of goods made in PRC in complex trials and litigations against for infringement of patent and design rights owned by a multinational corporation
  • Advising a listed company in Japan in acquisition of a listed company which has subsidiary in several Asian regions including Hong Kong and PRC
  • Advising Singapore investors in establishing tourist business in Japan including purchasing real assets and obtaining licenses
  • Advising a Japanese company in collaboration agreements regarding professional education in Indonesia and Vietnam with local enterprises
  • Advising a university spin-out start-up in Japan in establishing business in Hong Kong and international management of IP rights
  • Representing an administrator in bankruptcy of large-scale staffing companies in Japan
  • Representing a celebrity against a Japanese politician concerning defamation by posts on website and in published journals
  • Representing a captain in a complex litigation of a maritime incident happened in Japan
  • Advising and representing a major company of manufacturing in a litigation in relation to land contamination