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保坂 雅樹
保坂 雅樹


  • Of Counsel
  • Tokyo

Masaki Hosaka’s expertize is General Corporate and M&A practice. He was the Managing Partner of the firm for over a decade, and thereafter served as Chairman of The Management Board. He is currently enrolled in the Faculty of Education at the University of Tokyo.

Masaki Hosaka has expertise in General Corporate and M&A law. He was the Managing Partner of the firm from early 2011 to March 2021, and Chairman of The Management Board from April 2021 to March 2024. He is now an student in the Bachelor’s program at the University of Tokyo’s Faculty of Education.

Awards & Rankings





[present] Division of Educational Practices and Policies, Faculty of Education, the University of Tokyo
Harvard Law School (LL.M.)
The University of Tokyo (LL.B.)

Professional Experience

Of Counsel
Chairman of The Management Board  
Visiting Professor, Business Law Center, Institute of Business Law and Comparative Law and Politics, Graduate Schools for Law and Politics, The University of Tokyo 
Managing Partner 
Lecturer, Keio University Law School 
Lecturer, Chuo University 
Debevoise & Plimpton, New York