Dr. Alexandra Diehl

Partner, Frankfurt


“Alexandra Diehl stands out as “a highly experienced arbitration lawyer and excellent strategist” who “always goes the extra mile for her clients, never neglecting the small details and always keeping an eye on the bigger picture”.”
WWL, Arbitration 2022 - Future Leaders


Alexandra Diehl focuses on national and international dispute resolution with a special focus on arbitration (DIS, ICC, ICSID, SCC and ad hoc). She represents German and multinational clients in all phases of disputes and has started to develop an active arbitrator practice.

At ease with the multijurisdictional intricacies of transnational fact patterns, Alexandra supports clients with complex disputes relating to Post M&A, international investment law, IP and product liability issues. She also regularly advises clients on issues relating to private international law and cross-border taking of evidence. Moreover, Alexandra also has extensive experience in advising on class actions and mass claims, especially in the energy and automotive sector.

Prior to joining White & Case, Alexandra worked for eight years for a major British law firm in Düsseldorf and Frankfurt.

Alexandra regularly publishes on international arbitration matters. She teaches commercial arbitration at EBS Law School and international investment law at Heinrich-Heine-University of Düsseldorf.

Bars and Courts
New York
Dr iur
University of Würzburg
Second State Exam
Higher Regional Court of Düsseldorf
Global Technology
Suffolk University Law School
First State Exam (JD)
University of Münster


Tubes Manufacturer
Representing a French tube manufacturer in four ad hoc arbitrations seated in Germany in relation to a complex joint venture project, dispute involves German, English and French contract, corporate law and competition law.

Defending India against enforcement of a $132 million award pursued by a German company issued by a Swiss-seated tribunal in an arbitration arising under the Germany-India BIT.

Eastern European State
Counsel to an Eastern European state in an ICSID arbitration.

German hardware store company
Advice in relation to exit from Russia.

Major Insurance Company
Advising a major insurance company on claims resulting from the COVID-19 pandemic.

Automotive company
Representation of an automotive company in a multi-jurisdictional supplier dispute involving Germany, South Africa and the United States.

German consumer goods manufacturer
Representation of a German consumer goods manufacturer in an ICC arbitration subject to Saudi Arabian law seated in Paris.*

German telecommunications company
Representation of a German telecommunications company in a DIS arbitration based on a data delivery contract against a Belgian supplier.*

English Investor
Representation of an English investor in an UNCITRAL arbitration against Poland.*

Power Plant Operator
Counsel of a power plant operator in a series of 17 arbitrations concerning defects and delay and disruption claims originating in the construction of an 850 million EUR pulp-mill project in Sachsen-Anhalt (Germany).*

Diverse clients
IP-advice in various technology-driven transactions, e.g. Acino on sale of transdermal patch and implant businesses.*

* Matters prior to working for White & Case

Speaking Engagements

"The HCCH 2019 Judgments Convention: Prospects for Judicial Cooperation in Civil and Commercial Matters between the EU and Third Countries", Pre-Conference Video Roundtable, University of Bonn / HCCH, 29. Oct. 20, Panelist

"Investment Protection in the EU: Alternatives to intra-EU BITs, Investor/investment protection under EU law?" 2020 Annual Conference of the European Federation for Investment Law and Arbitration (EFILA), Panelist
The EU and the future of inter-national investment law and arbitration, "The EU's investment policy towards Asia", 2019 Annual Conference of the European Federation for Investment Law and Arbitration (EFILA), Panelist

"Collective Litigation in Germany, the EU and the U.S.: Model Declaratory Proceedings under Scrutiny: Class action light?", 24 Oct.18 Client Seminar – White & Case Office – Frankfurt, Germany


"Trends in German commercial litigation", The Legal 500, In-House Lawyer, Autumn 2021 (with Markus Langen, Detlev Gabel, Sonja Hoffmann, Alissa Arms, Swantje Behm)

"Developments and Trends in Class Actions, International Comparative Legal Guide" - Class and Group Actions 2021 (with Matthew Devine, Gregory Starner and Sonja Hoffmann)

"The new EU representative action from a German perspective – not a sudden, but a gradual revolution", December 2020 (with Markus Langen, Sonja Hoffmann and Carolin Kuehner)

"New DIS RULES after 20 years", February 2018 (with Markus Burianski)

"The Core Standard of International Investment Protection: Fair and Equitable Treatment", International Arbitration Law Library, Kluwer Law International, 2012

"IP Arbitration", Milbradt (Ed.), Patent Litigation in Germany, GLP, 2012

"The Challenge of Developing Common Mediation Law Regimes in Europe and the United States: From "Patchwork" to Coherence?", World Arbitration & Mediation Review, Vol. 3 No. 1, 2009 (with Siegfried H. Elsing)

"Tracing a Success Story or "The Baby Boom of BITs"", Reinisch/Knahr (Ed.), International Investment Law in Context, Eleven, 2008

Awards and Recognition

Rising Star, Dispute Resolution – Arbitration (including International Arbitration), Legal500 Germany 2022

"Lawyer to Watch" for International Arbitration, Handelsblatt 2022

Future Leader: Arbitration 2022 Who's Who Legal