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The Legal 500: Corporate Governance Comparative Guide

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The Legal 500: Corporate Governance Comparative Guide

New York partners Katsuyuki Yamaguchi and Kaoru Tatsumi co-authored the Japan chapter of The Legal 500: Corporate Governance Comparative Guide, published by Legalease Ltd.


山口 勝之

Katsuyuki has been the Managing Partner of our New York office since its inception. He has over 30 years of experience as an M&A and corporate lawyer, and his clients include numerous listed and private companies, both in Japan and internationally. He utilizes his expertise and in-depth knowledge of both Japanese and U.S. laws to provide practical advice and solutions to clients. Katsuyuki has significant experience in Cross-border M&A, Reorganization, Joint Ventures, and Public/Startups, for both mega and middle market transactions. As a corporate lawyer, he provides advice on Shareholders' Meetings & Investor Relations, Corporate Governance, Disputes, Corporate Crisis Management, IP, Information Law, Life Sciences, and Business Succession, primarily in relation to the service, manufacturing, healthcare, telecom, and entertainment industries. Katsuyuki maintains connections with lawyers around the world, which enhances his ability to provide one-stop legal advice to Japanese companies that are doing business globally, including those expanding into the United States, Europe, China, Southeast Asia, Latin America, and Africa. Katsuyuki sits on the board of several Japanese listed companies, which provides him with the unique advantage of being familiar with both legal requirements and the needs of management, making his advice practical, insightful, and meaningful.

辰巳 郁


  • NY LLP Partner
  • New York

Mr. Tatsumi mainly advises clients on international and domestic corporate transactions such as mergers, MBOs/LBOs, joint ventures, venture capital investments and other types of M&A transactions, as well as general corporate matters and commercial disputes relating to such corporate transactions; advising major business companies, financial institutions, and private equity funds, both in Japan and overseas.
 Mr. Tatsumi is one of only a few lawyers in Japan who has been seconded as an attorney to the Ministry of Justice, and during his tenure there he had a significant role in important governmental activities, such as the amendment of the Companies Act.
 Drawing on his significant expertise and deep knowledge, he has authored numerous books and articles in the area of M&A, as well as general corporate law. These publications provide practical solutions to complex legal issues, and bolster Mr. Tatsumi's reputation as a highly respected legal practitioner.