Anna Masser


Anna is Head of Germany International Arbitration. She focuses on international commercial arbitration and advises on all stages of dispute resolution.

Anna acts as lead counsel in international commercial arbitrations, in particular in the energy, plant engineering and renewable energies sectors. She also advises on disputes under long-term contracts in general. She has experience of conducting arbitrations under a wide range of rules including those of the ICC, SCAI, DIS, LCIA, SCC, as well as in ad hoc arbitrations also under UNCITRAL rules. She was qualified in Switzerland until 2016 and advises on German and Swiss law issues. She equally deals with issues relating to the recognition and enforcement of arbitral awards and judgments and is regularly appointed as arbitrator. Anna is a CEDR Accredited Mediator.

Anna is one of three arbitration lawyers in Germany being singled out as “Global Elite Thought Leader” by Who’s Who Legal in 2024 and she was featured as one of 45 under 45 globally by GAR. She is ranked by Chambers Global and by Chambers Europe as Band 3 arbitration counsel in Germany and is singled out as party representative by JUVE. She is member of the ASA board, serves as a member of the ICC Commission on Arbitration and ADR and is a council member of the German Arbitration Institute.


Published Work

  • Masser, A. (2013) "Choice of Law Clauses in Arbitration Agreements, Arbitration in Switzerland – The Practitioner’s Guide", Arroyo
  • Masser, A. (2013) "Commentary of Art. 28 Swiss Rules, Arbitration in Switzerland – The Practitioner’s Guide", Arroyo
  • Masser, A. (2013) "Commentary of Arts. 34 to 37 Swiss Rules", Swiss Rules of International Arbitration (Co‐Author with Dr Marc Veit, eds. Zuberbühler / Müller / Habegger)
  • Masser, A. (2012) "Die revidierte Schweizerische Schiedsgerichtsordnung (Swiss Rules)", IPRax 5/2012, p. 459 et seq (Co-Author with Dr Philipp Habegger)

Leadership Positions And Professional Affiliations

  • Member, DIS (former co-chair of DIS40)
  • Member, ASA (current board member)
  • Member, ICC Commission on Arbitration and ADR
  • Member, VIAC
Anna Masser provides excellent legal service in the client's ever-changing business environment with a clear client and commercial focus.”; “She adapts quickly to the changing circumstances, thinks outside the box and moves things forward.”; “Anna Masser is a superb lawyer with tactical, analytical and argumentative skills at a very high level.”; “She is extremely sharp, as well as even-minded and well balanced.
Chambers Global: Dispute Resolution, 2024
experienced, effective, outstanding strategist
competitor JUVE Handbook 2023/2024 – Dispute Resolution: Litigation and Arbitration/Mediation, 2024



Rechtsanwältin, Germany, 2007

Rechtsanwältin, Switzerland, 2013-2016


Second State Exam, Law, Germany, 2007

First State Exam, Law, Germany, 2004


English, German
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.