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Our office team

Members Introduction

Markus Janssen
 創業者兼代表パートナー 東京

Markus Janssen

  Founder & Partner in Tokyo, Japan

ウルリッヒ・ヒルデンブランド LL.M.

Ulrich Hildenbrand, LL.M.


Keisuke Enomoto

Hiromi Otsubo

Markus Janssen

  Founder & Partner in Tokyo, Japan

 Lived and worked in Japan for over 25 years and assisted multi-national enterprises as well as SMEs in numerous cross border transactions between Europe and Japan across several industries with Mergers & Acquisitions and other large transactions.


He has been participating in the management of leading international law firms in Tokyo as equity partner since 1998. Registered German lawyer and register in Japan as Attorney at Foreign Law.


Fluent in German, Japanese, English and Chinese.

Landmark Transactions

  • Ongoing Renewable Energy projects exceeding 1 GW and total investment of over 300 billion JPY (including Japan’s largest Solar Power project of 480 MW)

  • Currently representing three cross-border M&A transactions, thereof 2 acquisitions of listed companies (outbound and inbound)

  • Major German SME acquiring 2/3 of a Japanese SME with pioneer model of multidimensional governance 

  • Wilhelm Karmann GmbH greenfield establishment of Japanese oper-ations followed by sale to Magna during insolvency of parent company

  • Acquisition of  US nanotechnology company by Japanese technology group; negotiated global cooperation agreement with German partner

  • Merck acquisition of generic maker Mohan and later divestment of same; buy out of JV with Kanto Chemical and  divestment of partici-pation

  • General counsel of Mercedes Benz Finance for over 8 years, including establishment of floor plans

  • Spin-off Audi Japan from VW Japan into formerly listed dealership (JAXX) taken private

  • Reorganize JV of VW Finance changing Nippon Shinpan to service provider

  • Bosch acquisition of Zexel

Ulrich Hildenbrand, LL.M.

  • Senior Of Counsel

  • Admitted as lawyer in Germany since 2000

  • Registered in Japan as Foreign Lawyer since 2023

  • Working in Japan with Janssen Foreign Law Office and later Baker and McKenzie since 2004

  • Focuses on the areas of general corporate law, M&A, corporate reorganization and labor law.

  • Working languages: German, English and Japanese

Keisuke Enomoto

  • Partner

  • joined Atsumi & Sakai Janssen in 2017

  • admitted to the bar of Tokyo  in Japan in 2014

  • Focuses on labor law, contract law and general corporate law

  • Working languages: Japanese and English

Hiromi Otsubo

  • associate

  • admitted to the bar of Tokyo in Japan in 2020

  • Joined Atsumi & Sakai Janssen in March 2024

  • Focuses on general corporate law

  • Working languages: Japanese, English and Chinese(Conversation)

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