Markus Janssen

Markus Janssen, has lived and worked in Japan for over 20 years and assisted multinational enterprises as well as SMEs in numerous cross border transactions between Europe and Japan in several industries with Mergers & Acquisitions and other large transactions. He has been participating in management of leading international law firms in Tokyo as equity partner since 1998. (Foreign Lawyer registered at Tokyo 1st Bar Association, admitted in Germany). He speaks German, Japanese, English and Chinese.
Email: Markus Janssen
Tel. +81-3-6205-7989

Admitted 1985: Germany
2000: registered foreign lawyer (The Law of the Federal Republic of Germany)
Bar Association Dai-ichi Tokyo Bar Association
German Bar Association
IPBA: Inter-Pacific Bar Association
German Japanese juridical association
Board of the German Embassy’s Charity Fund (lifetime honorary member)
Education 1982: The University of Cologne Law School, Cologne high court, the first judicial examination
1985: Berlin high court judicial mastering, the second judicial examination
Background 1985-1990: Gassner, Groth, Siederer law office
1990-1997: Sonderhoff & Einsel law office
1997-2000: Haarmann, Hemmelrath & Partner
2000-2007: Janssen foreign law office (a joint venture with Asahi Koma law office), managing partner
2007-2013: Koma law office (foreign law joint venture with Baker Mckenzie law office), international partner
July 2013-: Janssen foreign law office (foreign law joint venture with Atsumi Sakai law office), managing partner
Practice Area M&A
Language German, English, Japanese, Chinese


  • “Industry 4.0 and the Internet of Things (IoT) in Germany'” International commercial law Vol. 44, No. 7, Japanese Institute of International Business Law, Inc. (July 2016), [Co-author]