Dr. Johannes P.Willheim


Francoforte + 49.69.9726.3985

Johannes Willheim has more than 20 years of experience as party representative, arbitrator, and mediator in international arbitration and litigation as well as counsel in aviation and energy-related transactions and regulatory matters. He is particularly sought after around the globe for his in-depth experience in the aviation, energy, and life sciences sectors as well as in antitrust law and government regulation. His representations and arbitrator appointments include agency, co-operation, corporate and post-transaction, engineering and construction, distribution, family, insurance, IP (intellectual property), pricing, and regulatory disputes.

Johannes is an authority in energy pricing disputes. As counsel, he has advised and represented energy companies along the value chain throughout the liberalization of EU energy markets and is currently doing the same on a global scale in the context of energy transition.

Leading international arbitral institutions, such as the ICC (International Chamber of Commerce), the DIS (German Arbitration Institute), and VIAC (Vienna International Arbitral Centre) appoint Johannes regularly as arbitrator. He is a vetted arbitrator of the The Hague Court of Arbitration of Aviation (HCAA) and the Court of Arbitration for Art (CfA).

Johannes is a co-editor and author of the GAR Guide to Aviation and Space Disputes and has published extensively on a myriad of legal topics. He is a regular guest lecturer at leading academic institutions like the Strauss Institute for Dispute Resolution at the Law School of Pepperdine University, the University of Chicago Law School, and the University of Stockholm as well as a frequent speaker at legal and industry conferences.

Johannes is based in Frankfurt and Paris.


  • Cardinal Health acquires leading patient product portfolio from Medtronic for $6.1 billionJones Day advised Cardinal Health on the acquisition of Medtronic's Patient Care, Deep Vein Thrombosis and Nutritional Insufficiency businesses for $6.1 billion in cash.
  • Pandox acquires seven hotels in Germany, Austria, and Netherlands for €415 million (US$440 million)Jones Day advised Pandox AB in connection with the €415 million (US$440 million) acquisition and related financing of seven hotels in Germany, Austria, and the Netherlands, from Invesco Real Estate European Hotel Real Estate Fund II FCP - SIP.
  • Randstad acquires Monster for $429 millionJones Day advised Randstad Holding nv (AMS: RAND), a leading human resources services provider, in the acquisition of Monster Worldwide, Inc. (NYSE: MWW).
  • Atlas Holdings completes first phase of purchase of NCR Corporation's Interactive Printer Solutions DivisionJones Day represented affiliates of Atlas Holdings, LLC in its acquisition of the Interactive Printer Solutions ("IPS") division of NCR Corporation.
  • Euronext-listed company migrates to United KingdomJones Day advised a Euronext-listed company on its corporate migration into the United Kingdom to safeguard its U.S. and UK operations from possible adverse Brexit consequences.
  • ABH Holdings attempts to sign deal to acquire Zuno BankJones Day represented ABH Holdings S.A. on its attempted acquisition of Zuno Bank AG from Raiffeisen Bank International AG.
  • Goldman Sachs and Highgate Hotels acquires K+K Hotels GroupJones Day advised a consortium led by Goldman Sachs and Highgate Hotels, a leading hospitality investment and management company, in its acquisition, acquisition financing, and debt restructuring of the K+K Hotels group, which owns a portfolio of ten boutique hotels located in London, Paris, Barcelona, Munich, Vienna, Prague, Budapest, and Bucharest.
  • NEP Group acquires Mediatec GroupJones Day advised NEP Group, Inc. in its acquisition of Mediatec Group, one of Europe’s largest corporations in delivering integrated technical solutions for event and television productions with activities across Europe (including Sweden, Finland, Norway, Denmark, Germany, Switzerland, Austria, the UK, and Spain).
  • SEB AG-led syndicate provides €900 million financing to voestalpineJones Day advised SEB AG in connection with the €900 million (US$976.5 million) term loans and revolving facilities provided to voestalpine AG, a steel-based technology and capital goods company.
    • November 9, 2023
      Miami Arbitration Week (MAW) 2023 - Aviation & Aerospace Disputes
    • October 13, 2023
      GAR (Global Arbitration Review) Live – Arbitration as Part of Competition Remedies
    • October 12, 2023
      South-Eastern Europe Arbitration Conference – Unlocking the Future Trends in International Arbitration
    • September 21, 2023
      Inside VIAC (Vienna International Arbitral Centre) - Effiziente Streitbeilegung nach den Wiener Regeln (Efficient Dispute Resolution Under the Vienna Rules) Frankfurt, Germany
    • September 4, 2023
      Inaugural Armenia International Arbitration Conference – Types of Emerging Climate Change-Related Disputes and Suitability of International Arbitration as a Dispute Mechanism
    • July 24, 2023
      Austrian Arbitration Academy - Energy Arbitration – Law and Practice
    • July 7, 2023
      CDRC 2023 Inaugural Pre - Moot Conference
    • July 2, 2023
      Summer Elsa Law School
    • May 2, 2023
      Flame 2023
    • April 28, 2023
      Hybrides Juristisches Forum
    • March 27–31, 2023
      Paris Arbitration Week - Specialised Dispute Resolution Within the Aviation Industry Has Taken Off
    • March 27, 2023
      European Gas Conference 2023
    • March 27–29, 2023
      European Gas Conference 2023 - Securing Long-Term LNG Supplies to the EU Amids Energy Transition
    • March 21, 2023
      eFlame – Enabling and Protecting New Investments in Gas Infrastructure in Europe
    • November 10 and 11, 2022
      IV CBMA International Mediation Conference - Integrated Disputes Management – From Process Based to Solution Motivated Disputes Management
    • October 5, 2022
      eFlame: The building blocks of a new generation of LNG supply agreements for global LNG markets
    • September 15, 2022
      Danish Arbitration Day - Gas Disputes - Past, Present and Future
    • September 8, 2022
      ICC Young Arbitration & ADR Forum (YAAF) - Psychology in Arbitration and Mediation – The Impact of Bias
    • July 9, 2022
      ELSA Dispute Resolution Summer Law School 2022 – Planning a Future Career in Dispute Resolution: The Art of Advocacy
    • June 22, 2022
      Center for American and International Law Webinar - Paradigm Shift in the Regulation of EU Energy Markets, Russia/Ukraine Conflicts, and US and Global Energy Markets
    • June 21, 2022
      Singapore Institute of Arbitrators (SIArb) Webinar Series: Focus on Energy Disputes – Part 1: Gas
    • May 13, 2022
      12th Annual Roschier Arbitration Forum 2022 – Assessing, Presenting and Proving Damages for Breach of Share Purchase Agreements
    • May 3-5, 2022
      Flame – Europe’s Largest Gas and LSG Event – Gas Pricing Arbitrations
    • April 27, 2022
      American German Business Club (AGBC) – The Impact of the Irreversible Paradigm Shift on EU Energy Markets on EU-US Energy Relations
    • April 19, 2022
      Houston International Arbitration Club (HIAC) April Meeting – The Global Oil & Gas Industry Shaken Up and How the Markets Are Responding
    • April 18-19, 2022
      3rd Annual In-Person Hydrogen & LNG Forum 2022 – The Irreversible Paradigm Shift in European Energy Markets and the Dilemmas Caused by It
    • March 31, 2022
      8th Harvard International Arbitration Conference Program, Panelist — Arbitrators' Powers to Review Contracts — Hardship and Force Majeure in Comparative Perspectives
    • February 23-24, 2022
      4th Energy Sustainability Forum 2022, Keynote on Managing Commercial and Legal Risks in Global Gas Markets
    • December 8-9, 2021
      2nd Energy Transition and Innovation Forum organized by U.S. Energy Stream, Keynote Presentation on Managing Risks from Decommissioning Oil & Gas Infrastructure
    • September 15, 2021
      17th Annual Frankfurt Drafting School - Introductory Lecture on International Commercial Arbitration
    • April 9, 2021
      A Primer on Integrated Dispute Resolution
    • November 11, 2020
      Jones Day Speaker Series, Peking University - Introduction into International Arbitration
    • October 13, 2020
      Flame Virtual - Dealing with Force Majeure and other legal and commercial risks in present times.
    • October 13, 2020
      LNG Amsterdam - Dealing with Force Majeure and Other Legal and Commercial Risks in Present Times
    • October 12, 2020
      Flame Virtual - Managing price risks and disputes in globalizing gas markets.
    • November 4, 2019
      2nd Houston Gas & LNG Forum 2019 Managing Price Reviews in Global Gas Markets
    • July 11, 2019
      International Dispute Professional Academy
    • July 7, 2019
      2019 Consensual Dispute Resolution Competition (CDRC) Vienna
    • June 18, 2019
      9th Annual European Gas & LNG Supply Contracts Forum
    • May 30 - June 8, 2019
      Pepperdine University 2019 Summer Intensive Program in International Commercial Arbitration
    • April 16, 2019
      The Midnight Clause
    • March 20, 2019
      Workshop on Law and Democracy in Europe
    • March 7, 2019
      2nd Annual GAR Live Zurich
    • March 2, 2019
      2019 Vienna Arbitration Days
    • February 22, 2019
      Keynote Speech - The Future of Dispute Resolution – Evolutionary Transformation Without Disruption
    • February 21, 2019
      2018-2019 Lunch Series on International Arbitration: Lecture 3
    • January 29, 2019
      A Panel, presented by the Law School of the University of Chicago, on Building an International Career in Law
    • January 28, 2019
      2018-2019 Lunch Series on International Arbitration: Lecture 2
    • December 18, 2018
      41th “Competition Talk” organized and hosted by the Austrian Federal Competition Authority
    • December 4, 2018
      Art Law Symposium
    • July 26 - August 8, 2018
      Master of Laws (LL.M.) in Dispute Resolution Pepperdine University
    • July 17, 2018
      Consensual Dispute Resolution Competition (CDRC)
    • June 20, 2018
      C5 Long Term Gas Supply Contracts: Europe
    • June 7, 2018
      V Allerhand Arbitration & Dispute Resolution Summit
    • June 6, 2018
      Open Event accompanying the V Allerhand Dispute Resolution, Mediation and Arbitration Summit
    • May 22-23, 2018
      C5 Upstream Oil & Gas Legal Forum
    • May 14-17, 2018
      Flame 2018 - Europe's Largest Midstream Gas & LNG Event
    • April 26, 2018
      GAR Live Zürich
    • April 10-11, 2018
      C5 Long Term Gas Supply Contracts: Asia 2018
    • April 5-6, 2018
      Advanced International Arbitration - Master Program on International Commercial Arbitration Law (ICAL)
    • December 13-14, 2017
      5th Frankfurt Gas Forum 2017
    • October 11, 2017
      International Bar Association Annual Conference - Some Like it Hot: The Art of Mediating Disputes Between Law Firms, Lawyers and Staff
    • September 29, 2017
      DAV Turkey 3rd International Arbitration Congress, Istanbul Arbitration Centre
    • September 28, 2017
      New Perspectives on the Advantages of Resolving International Commercial Disputes in International Arbitration
    • July 31 - August 6, 2017
      ELSA Vienna Summer Law School on Dispute Resolution 2017
    • July 10-14, 2017
      The Consensual Dispute Resolution Competition (CDRC)
    • May 25-28, 2017
      ELSA Freiburg Spring Conference on International & European Law
    • April 28, 2017
      Master Program on International Commercial Arbitration Law (ICAL)
    • March 24, 2017
      Global Pound Conference - Shaping the Future of Dispute Resolution & Improving Access to Justice
    • February 27-28, 2017
      Long Term Gas Supply Contracts: Asia 2017
    • February 14-19, 2017
      International Summit on Arbitration (ISA)
    • January 24-25, 2017
      Upstream Oil & Gas Legal Forum 2017
    • November 3-4, 2016
      European Gas Transmission Conference
    • September 27-28, 2016
      DIS Autumn Conference
    • July 31 - August 7, 2016
      The 5th ELSA Law School on Dispute Resolution
    • May 19, 2016
      Jones Day Breakfast - Resolving Disputes of Financial Transactions in Arbitration – Revealing the Secrets
    • February 24, 2016
      Why Major International Disputes Can Often Be Better Resolved in Arbitration
    • February 22, 2016
      Commercial, Political, and Regulatory Risks in Foreign Operations
    • February 9, 2016
      The European Gas Market: Supply and Demand Dynamics Exclusive Roundtable
    • January 19-21, 2016
      9th Annual European Gas Conference 2016
    • November 3-4, 2015
      The International Gas Conference
    • September 29, 2015
      Energy Series - Resolving Energy Disputes
    • September 16, 2015
      The Usage of Authorities in Memoranda, 11th Annual Frankfurt Drafting School, Frankfurt Moot Alumni Association
    • 15. September 2015
      Energietage 2015: Ölindizierte Verträge als Auslaufmodell? Zukunft der Preisformeln in Langfristverträgen (Oil-indexed agreements a phase-out model? The future of price formulae in long-term agreements)
    • September 14-16, 2015
      18th IIR Annual Industry Meeting: Natural Gas 2015
    • September 14-16, 2015
      11th Annual Frankfurt Drafting School 2015, Frankfurt Moot Alumni Association (FMAA)
    • August 2015
      Introduction into International Arbitration, ELSA Dispute Resolution Summer School
    • July 2, 2015
      5th Annual Congress on Successfully Negotiating & Renegotiating Long Term Gas Supply Contracts: Assessing the Landscape for Pricing Disputes Across Europe
    • June 19, 2015
      Access to essential infrastructure and IP, IBA/AI Seminar, Enforcement of EU Competition Law at National Level