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Klaus Sachs
Partner

Prof. Dr. Klaus Michael Sachs

Rechtsanwalt

Languages
  • German
  • English
  • French
  • Italian
  • Spanish

Klaus Sachs is among Germany’s leading experts for domestic and international arbitration proceedings. With more than 25 years of experience as counsel and arbitrator, he has acted in more than 200 proceedings under all major arbitration rules, including DIS, ICC, LCIA, Swiss Rules, Vienna Rules, Moscow Chamber of Commerce, SCC, CRCICA, JCAA as well as in ad hoc proceedings (including UNCITRAL Rules).

As arbitrator, Klaus mainly acts in corporate law, joint venture and M&A related disputes, but also regularly in proceedings related to licence and cooperation agreements in the industrial plant construction and energy sectors.

In addition, Klaus has so far been chairman or co-arbitrator in more than 30 investment disputes under the ICSID and UNCITRAL Rules. Underlining his outstanding expertise, he, among others, chaired arbitration proceedings at the World Bank in Washington between the USA and Canada in a dispute arising from a softwood lumber agreeement between the two countries.

Klaus Sachs joined CMS in 1985 and has been a partner since 1987. His legal career started at Schilling, Zutt & Anschütz in 1977, followed by four years in the Paris office of Curtis, Mallet-Prévost, Colt & Mosle. Klaus is an honorary professor of arbitration at the University of Munich and co-editor of SchiedsVZ (German arbitration journa)

Awards & Recognitions
01
  • Quote
    Listed for Arbitration / Dispute Resolution / Mediation
    Deutschlands beste Anwälte 2025 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for Conflict Resolution
    Deutschlands beste Anwälte 2025 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for Conflict Resolution
    Deutschlands beste Anwälte 2025 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for International Arbitration
    Deutschlands beste Anwälte 2025 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed as Star Individual
    Chambers Global, Chambers Germany, 2025
  • Quote
    Dispute Resolution: Arbitration Lawyer of the Year
    The Legal 500 Deutschland, 2025
  • Quote
    "Klaus Sachs is a shining light - he is the number one arbitrator in Germany.", client
    Chambers Germany, 2025
  • Quote
    "Klaus Sachs is widely considered an outstanding leader in the German and European arbitration world."
    Chambers Germany, 2025
  • Quote
    "Working with Klaus Sachs is a delight.", client
    Chambers Germany, 2025
  • Quote
    Konfliktlösung: Schiedsrichter
    JUVE Handbuch, 2024/2025
  • Quote
    „Oft empfohlen“ für Konfliktlösung
    JUVE Handbuch, 2024/2025
  • Quote
    „Erfahrung pur“, Wettbewerber; v.a. Schiedsrichter
    JUVE Handbuch, 2024/2025
  • Quote
    Listed for Arbitration / Dispute Resolution / Mediation
    Deutschlands beste Anwälte 2024 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for Conflict Resolution
    Deutschlands beste Anwälte 2024 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for International Arbitration
    Deutschlands beste Anwälte 2024 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Lawyer of the Year for International Arbitration
    Deutschlands beste Anwälte 2024 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Leading Individual for Arbitration
    The Legal 500 EMEA, 2024
  • Quote
    Listed as star individual for Real Estate
    Chambers Europe, 2024
  • Quote
    Listed as star individual for Private Equity
    Chambers Global, 2024
  • Quote
    ‘Klaus Michael Sachs shows great leadership, outstanding experience, and always hits the right note.‘, client
    Chambers Europe, 2024
  • Quote
    ‘Klaus Michael Sachs shows great leadership, outstanding experience, and always hits the right note.‘, client
    Chambers Global, 2024
  • Quote
    Ausgezeichnet als führender Schiedsrichter
    JUVE Magazin 06/2024
  • Quote
    Listed as "Thought Leader"
    Who's Who Legal 2024 – Arbitration
  • Quote
    „über jeden Zweifel erhaben, einfach top“, Wettbewerber; v.a. Schiedsrichter
    JUVE Handbuch, 2023/2024
  • Quote
    „Oft empfohlen“ für Konfliktlösung
    JUVE Handbuch, 2023/2024
  • Quote
    "He is an excellent partner leading his senior team to great effectiveness, having efficiency in mind.", client
    Chambers Europe, 2023
  • Quote
    "Klaus Michael Sachs is very experienced.", client
    Chambers Europe, 2023
  • Quote
    "His competence and experience are absolutely outstanding.", client
    Chambers Europe, 2023
  • Quote
    Listed as star idividual
    Chambers Europe, 2023
  • Quote
    Listed as notable practitioner
    Chambers Europe, 2023
  • Quote
    Listed as notable practitioners
    Chambers Global, 2023
  • Quote
    "His competence and experience are absolutely outstanding.", client
    Chambers Global, 2023
  • Quote
    "Klaus Michael Sachs is very experienced.", client
    Chambers Global, 2023
  • Quote
    "He is an excellent partner leading his senior team to great effectiveness, having efficiency in mind.", client
    Chambers Global, 2023
  • Quote
    Listed for Arbitration / Dispute Resolution / Mediation
    Deutschlands beste Anwälte 2023 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for Conflict Resolution
    Deutschlands beste Anwälte 2023 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for Conflict Resolution
    Deutschlands beste Anwälte 2023 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for International Arbitration
    Deutschlands beste Anwälte 2023 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Lawyer of the Year for International Arbitration
    Deutschlands beste Anwälte 2021 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    Listed for Conflict Resolution
    Deutschlands beste Anwälte 2021 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    "Outstanding practitioner with a vast amount of experience in presiding over large international arbitrations. He is particularly experienced in complex investment and shareholder disputes."
    Chambers Global, 2021
  • Quote
    Listed as notable practitioner
    Chambers Europe, 2021
  • Quote
    "Sources heap praise on CMS Hasche Sigle's Klaus Michael Sachs, lauding him as 'one of the best arbitrators' in the international market who is 'in a class of his own'."
    Who's Who Legal 2021 – Arbitration
  • Quote
    "exceptionally experienced and competent in arbitration", competitor
    JUVE German Commercial Law Firms 2021 (GCLF)
  • Quote
    "Recommended" for Dispute Resolution
    JUVE German Commercial Law Firms 2021 (GCLF)
  • Quote
    "eminent authority", competitor
    JUVE German Commercial Law Firms 2020 (GCLF)
  • Quote
    "Klaus Michael Sachs is highlighted as a 'phenomenal, well-prepared practitioner' and 'an excellent arbitrator who brings great attention to detail'."
    Who's Who Legal 2020
  • Quote
    Listed for Arbitration / Dispute Resolution / Mediation and Conflict Resolution
    Deutschlands beste Anwälte 2020 – Handelsblatt in Kooperation mit Best Lawyers
  • Quote
    "Klaus Michael Sachs is widely held in high esteem for his outstanding expertise in arbitration, regularly presiding over highly complex and politically sensitive investor-state disputes."
    Chambers Europe, 2022
  • Quote
    "star", client
    Chambers Europe, 2022
  • Quote
    Listed as notable practitioner
    Chambers Europe, 2022
  • Quote
    Listed as Star Individual
    Chambers Europe, 2022
  • Quote
    "star", client
    Chambers Global, 2022
  • Quote
    Listed as notable practitioner
    Chambers Global, 2022
  • Quote
    Listed as Star Individual
    Chambers Global, 2022
  • Quote
    "cooperation based on mutual trust, high quality", competitor
    JUVE German Commercial Law Firms 2022 (GCLF)
  • Quote
    "Recommended" for Dispute Resolution
    JUVE German Commercial Law Firms 2022 (GCLF)
  • Quote
    „außergewöhnl. erfahren u. kompetent“, Wettbewerber)
    JUVE Handbuch, 2022/2023
  • Quote
    „Oft empfohlen“ für Konfliktlösung
    JUVE Handbuch, 2022/2023

Relevant experience

  • Chairman in ICC arbitration related to a joint venture dispute in the telecoms sector (value of the dispute: over EUR 2,5 billion)
  • Chairman in ICC arbitration related to M&A warranty claims (value of dispute: over EUR 300 million)
  • Chairman in ICC arbitration related to a gas price revision claim (value of dispute: over EUR 1 billion)
  • Co-arbitrator in a number of ICC, DIS and SCC arbitrations related to large-scale plant construction, gas price revision claims, joint venture disputes and distribution agreements
  • Chairman in a number of ICSID arbitrations related to claims filed by investors against Pakistan, Venezuela, Korea and Serbia
  • Co-arbitrator in several ICSID and UNCITRAL proceedings related to investment arbitration cases and claims against Egypt, Spain, Italy and Senegal

Publications

  • Zeitschrift für Schiedsverfahren – German Arbitration Journal (SchiedsVZ), C.H. Beck Verlag, Mitherausgeber
  • "Investment Arbitration", International Construction Disputes, Beck/Hart/Nomos, 2022, Roquette/Pröstler, zusammen mit Susanne Schwalb, S. 117-145
  • "Do we deliver? How to make international arbitration more efficient" in: Liber Amicorum Michael Moser, 2020
  • "Internationales Schiedsverfahren", Neue Techniken in der Handelsschiedsgerichtsbarkeit - Praxishandbuch, Verlag C.H. Beck, 2019, Salger/Trittmann, S. 500-523
  • "ICANN’s Dispute Resolution Mechanisms: With Great Power Comes Great Responsibility" in: Jurisdiction, Admissibility and Choice of Law in International Arbitration, Liber Amicorum Michael Pryles; Wolters Kluwer 2018, Neil Kaplan, Michael Moser, zusammen mit Friederike Fronius, S. 315-329
  • "Mid-stream conference: An innovative tool for saving time and costs of arbitral proceedings", Festschrift für Reinhold Geimer zum 80. Geburtstag, C.H. Beck, 2017, Seiten 575-584
  • "Commercial Arbitration in Germany", Richard Kreindler, Rainmar Wolff and Markus S. Rieder, Oxford University Press, Arbitration International 2016, Volume 3
  • "International Arbitration – Comparative and Swiss Perspectives", Daniel Girsberger und Nathalie Voser, Schultheiss/Nomos, 2016, Zeitschrift für Schiedsverfahren 4/2016, S. 217
  • "How to solve the tensions between expert determination and arbitration in the context of M&A contracts", International Arbitration Under Review, Liber Amicorum for John Beechey; ICC Publication No. 772 E, 2015, Andrea Carlevaris, Laurent Lévy, Alexis Mourre, Eric A. Schwartz, Seiten 363-371
  • "Zur Group of Companies Doctrine und dr Auslegung der subjektiven Reichweite von Schiedsvereinbarungen – Welches Recht ist anwendbar?", Festschrift für Siegfried H. Elsing zum 65. Geburtstag, Verlag Recht und Wirtschaft, 2015, Werner F. Ebke, Dirk Olzen, Otto Sandrock, zusammen mit Tilman Niedermaier, Seiten 475-491
  • "Schadensersatz wegen Klage vor dem staatlichen Gericht anstatt dem vereinbarten Schiedsgericht: Scharfe Waffe oder stumpfes Schwert im Arsenal schiedstreuer Parteien?", Zwischenbilanz - Festschrift für Dagmar Coester-Waltjen zum 70. Geburtstag, Verlag Ernst und Werner Gieseking, 2015, zusammen mit Evgenia Peiffer, S. 713-724
  • "Die Durchsetzung von Document Production Orders in internationalen Schiedsverfahren", Zeitschrift für Vergleichende Rechtswissenschaft, R&W Fachmedien Recht und Wirtschaft, Deutscher Fachverlag GmbH, Frankfurt am Main, 114. Band, November 2015, Klaus Peter Berger, Rolf Birk, Werner F. Ebke, Bernhard Großfeld, Susanne Kalss, Peter V. Kunz, Peter Mankowski, Karl Matthias Meessen, Hanno Merkt, Otto Sandrock, Francesco A. Schurr, zusammen mit Tilman Niedermaier, S. 449-468
  • "Die Rechtsfigur der 'adverse inferences' in der internationalen Schiedsgerichtsbarkeit", Wissenschaftlicher Gesprächskreis Schiedsrecht München, Nomos Verlag, 2015, in Eberl (Hg.), zusammen mit Tilman Niedermaier, S. 129-148
  • "Import of Umbrella Clauses by Way of Invoking Most-Favored-Nation-Treatment Clauses in International Investment Treaty Law", Festschrift für Rolf A. Schütze zum 80. Geburtstag, C.H. Beck Verlag, 2014, zusammen mit Susanne Häusler, S. 499-509
  • "Convention on the Recognition and Enforcement of Foreign Arbitral Awards of 10 June 1958", Reinmar Wolff (Hrsg.), Beck 2012 (in Gemeinschaft mit Hart/Oxford und Nomos/Baden-Baden), NJW 2013, 519, 520 (Heft 8)
  • "Mock Arbitrations", Arbitrators' Insights, Essays in Honour of Neil Kaplan, Sweet & Maxwell, 2012, Chiann Bao, Felix Lautenschlager, zusammen mit Nicolas Wiegand, S. 339-353
  • "Overriding Mandatory Provisions before Arbitral Tribunals – Some Observations", Festschrift für Bernd von Hoffmann zum 70. Geburtstag, 2011, zusammen mit Tilman Niedermaier, S. 1051 - 1065
  • "Protocol on Expert Teaming: A New Approach to Expert Evidence", International Council for Commercial Arbitration, Congress Series No. 16, Kluwer Law International, 2011, zusammen mit Nils Schmidt-Ahrendts, S. 135 - 148
  • "Diverging Concepts of the Principle of Competence-Competence", New Developments in International Commercial Arbitration, Schulthess Editions Romandes, 2010, Christoph Müller and Antonio Rigozzi, zusammen mit Nils Schmidt-Ahrendts, S. 1 ff.
  • "Fast-Track Arbitration Agreements of MAC Clauses", Liber Americorum Bernardo Cremades, Wolters Kluwer, 2010, M.Á Fernández-Ballesteros and Davíd Arias, La Ley, S. 1051 ff.
  • Settlement efforts in arbitration“, Revista de Arbitragem e Mediação, 2010, zusammen mit Nils Schmidt-Ahrendts, S. 161 ff.
  • "Expert Evidence under the 2010 IBA Rules", International Arbitration Law Review, Vol. 13 Issue 5, 2010, zusammen mit Nils Schmidt-Ahrendts, S. 216 ff.
  • "The Vienna Rules – A Commentary on International Arbitration", Franz T. Schwarz, Christian W. Konrad, Wolters Kluwer, Global Arbitration Review, 2010, Vol. 5 Issue 4
  • "Schiedsgerichtsbarkeit Kompendium für die Praxis", Dr. Richard Kreindler, Jan K. Schäfer, Reinmar Wolff, Verlag Recht und Wirtschaft GmbH, 2006, Zeitschrift für Schiedsverfahren (SchiedsVZ) 3/2009, S. 172 ff.
  • "Die Wahl der richtigen Verfahrensregeln", Taktik im Schiedsverfahren, Dr. Otto Schmidt Verlag, 2008, Wissenschaftlicher Gesprächskreis Schiedsrecht München, zusammen mit Torsten Lörcher, S. 153 ff.
  • "La portée du contrôle exercé par les tribunaux étatiques allemands sur les sentences arbitrales relatives au droit communautaire de la concurrence", Gazette du Palais, Les Cahiers de l'Arbitrage, 2008/2, zusammen mit Katharina Hilbig, S. 3 ff.
  • "La protection de la partie faible en arbitrage", Gazette du Palais, Les Cahiers de l’Arbitrage, 2007/2, Seiten 22 ff.
  • "Commentary on §§ 1042 to 1050 of the Code of Civil Procedure", Arbitration in Germany – The Model Law in Practice, Kluwer Law International, 2007, Karl-Heinz Böckstiegel, Stefan Michael Kröll and Patricia Nacimiento, zusammen mit Torsten Lörcher, S. 275 ff.
  • "Praktische Durchführung des Schiedsgutachtenverfahrens und Besonderheiten bei internationalen Verfahren", Schiedsgutachten versus Schiedsgerichtsbarkeit, Schriftenreihe der Deutschen Institution für Schiedsgerichtsbarkeit, Band 21, Carl Heymanns Verlag, 2007, S. 15 ff.
  • "Time and Money: Cost Control and Effective Case Management", Pervasive Problems in International Arbitration, Kluwer Law International, 2006, Loukas A. Mistelis and Julian D.M. Lew, S. 103 ff.
  • "Les mesures provisoires dans l'arbitrage en droit allemand", Médiation et arbitrage, LexisNexis, Paris, 2005, Loic Cadiet, Thomas Clay and Emmanuelle Jeuland, S. 387 ff.
  • "Die rechtliche Abgrenzung des Schiedsgutachtens vom Schiedsverfahren am Beispiel des Unternehmenskaufvertrages – Zugleich ein deutsch-französischer Rechtsvergleich", Festschrift für Peter Schlosser zum 70. Geburtstag, Mohr Siebeck, 2005, S. 805 ff.
  • "The interaction between expert determination and arbitration", ASA Special Series No. 24, 2005, Arbitration of Merger and Acquisition Disputes, S. 235 ff.
  • "Schiedsgerichtsverfahren über Unternehmenskaufverträge – unter besonderer Berücksichtigung kartellrechtlicher Aspekte", Zeitschrift für Schiedsverfahren (SchiedsVZ), 3/2004, S. 123 ff.
  • "Use of documents and document discovery: 'Fishing Expeditions' Versus Transparency and Burden of Proof", Zeitschrift für Schiedsverfahren (SchiedsVZ), 5/2003, S. 193 ff.
  • "Erstreckung von Schiedsvereinbarungen auf Konzernunternehmen", Schiedsgerichtsbarkeit bei Mergers & Acquisitions, DIS-Materialien MAT VIII, 2001, Deutsche Institution für Schiedsgerichtsbarkeit e.V., S. 51 ff.
  • "The Enforcement of Awards Nullified in the Country of Origin: The German Perspective", Improving the Efficiency of Arbitration Agreements and Awards: 40 Years of Application of the New York Convention, International Council for Commercial Arbitration, Congress Series No. 9, Kluwer Law International, 1999, S. 552 ff.
  • "Das bilaterale französisch-algerische Schiedsabkommen vom 27.03.1983 – Ein Muster auch für andere Staaten?", Praxis des Internationalen Privat- und Verfahrensrechts (IPRax), 5/1986, S. 309 ff.
  • "Gemeinschaftsunternehmen in Algerien (Société d'Economie Mixte)", Recht der Internationalen Wirtschaft (RIW), 3/1985, S. 201 ff.
  • "EG-Handelspolitik und zwischenstaatliche Kooperationsabkommen", Schriftenreihe Europäische Wirtschaft, Band 85, Nomos-Verlag, 1976, (Dissertation)

Memberships & Roles

  • Member of the Advisory Board of ICCA (former member of the Governing Board)
  • Board member of the German Institution of Arbitration (DIS)
  • Board member of the Swiss Arbitration Association (ASA)
  • 2013 - 2019: candidate nominated by the Federal Republic of Germany for the lists of arbitrators maintained by ICSID
  • FIA Contract Recognition Board
  • Working Group for drafting the IBA Guidelines on Conflicts of Interest in International Arbitration
  • Former vice president of the International Court of Arbitration of the International Chamber of Commerce (ICC)
  • Former vice president of the London Court of International Arbitration (LCIA)
  • Former vice chair of the International Bar Association (IBA), Committee D
  • Former board member of the Chamber of Arbitration of Milan

Lectures list

  • Gastvorlesung an der HU Berlin: „Do we deliver? How to make international arbitration more efficient” (November 2019)
  • Münchener Juristische Gesellschaft: “Schiedsgerichtsbarkeit – Abschied von der Staatlichen Justiz? (April 2016)
  • 9. Berliner Rechtspolitische Konferenz: „Reformüberlegungen zur internationalen Schiedsgerichtsbarkeit“ (2014)
  • Hong Kong International Arbitration Center: „Maximising Opportunities and Managing Risks in Asia” (2013)
  • Paris Arbitration Academy: Insolvency Proceedings and International Arbitration (Juli 2011)
  • Université de Neuchâtel: “Diverging Concepts of the Principle of Competence-Competence” (November 2010)
  • ICCA Congress in Rio de Janeiro: “Protocol on Expert Teaming: A New Approach to Expert Evidence” (2010)
  • "Who really wants to settle the dispute?", ICC Young Arbitrators Forum, Rio de Janeiro, Dezember 2009
  • "Place of arbitration: Does it matter?", CIArb/ICC Conference, Tunis, Oktober 2009
  • "Praktische Durchführung des Schiedsgutachtenverfahrens und Besonderheiten bei internationalen Verfahren", DIS Herbsttagung, Hamburg 2006
  • "Protection of the weak party in arbitration", 6th Congress of the Brazilian Arbitration Committee, Salvador do Bahia, November 2006
  • "Comments on the new Italian Arbitration Law", Italian Bar Association, Rome 2006
  • "Practical aspects of Polish-German arbitration proceedings", German-Polish Chamber of Commerce, Warsaw, 2005
  • "Harmonisation of Arbitration Rules", Place de Droit 2005, Paris
  • "Time and Money in International Arbitration", 20th anniversary of the School of International Arbitration, Queen Mary University, 2005
  • "Standardisation of arbitration rules or competition for the best system?", 3rd Petersberger Schiedstage 2005
  • "The interaction between expert determination and arbitration proceedings", ASA 2005 Basel;
  • "How to accommodate divergent cultural expectations", IBA 2004 International Arbitration Day São Paolo
  • "Arbitration on M&A contracts – including specific consideration of competition law aspects", DIS 2003 Köln
  • "Recognition and Enforcement of Arbitral Awards", IBA 2003 San Francisco
  • "Fishing Expeditions” Versus Transparency and Burden of Frankfurt (March 2003) Proof", DAJV Symposium
  • "The extension of arbitration clauses to non-signatory parties", AAA Symposium Montreal (April 2002)
  • "The validity and scope of arbitration clauses", IBA Brussels 2002 Int. Arbitration Day
  • "The extension of an arbitration clause to a non-signatory party", DIS 2001 Dresden
  • "Interim Measures in Arbitration in Germany", IBA 1999 Barcelona;
  • "Implementation of the UNCITRAL Model Law Worldwide - The New German Arbitration Act 1998 and How it Will Affect Arbitration in Germany", IBA 1998 Vancouver
  • "The Enforceability of Awards Nullified in their Country of Origin", ICCA 1998 Paris

Education

  • 1977: Admitted as a lawyer
  • 1976: PhD
  • 1975: Trainee with Food and Agriculture Organisation of the United Nations, Rome
  • 1975: Second state examination in law
  • 1973: First state examination in law
  • Law studies in Cologne and Heidelberg
  • 1969: Abitur (German A-levels) at the European School of Brussels
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