Stéphanie Oneyser is counsel in the Litigation and Arbitration Team. She specializes in dispute resolution and represents parties in state courts proceedings, in enforcement and legal assistance matters and in international arbitration proceedings in all aspects of commercial law. Her practice focuses on insolvency law, insolvency-related disputes as well as debt collection and enforcement proceedings. She further specializes in insurances and health care (including primary insurance and reinsurance companies). She regularly publishes in these fields of expertise.

Stéphanie Oneyser studied at the University of Freiburg i. Üe. (MLaw, 2009) and at the University of Bristol, England (Erasmus). She completed her traineeship in a major commercial law firm in Zurich and worked as a judicial law clerk at the district court of Horgen. She was admitted to the bar in 2013 in the canton of Zurich and obtained the title of Associate in Risk Management (ARM) in 2017 and a certificate of Advanced Studies (CAS) in tort law and insurance law at the University (HSG) of St. Gallen in 2018. Before joining Walder Wyss, Stéphanie Oneyser worked as an associate in the litigation, arbitration and insolvency teams of a Switzerland-wide operating commercial law firm in Zurich.

Stéphanie Oneyser is Vice-President of the Insolvency Commission of International Association of Young Lawyers (AIJA) and a board member of the Association for debt collection and bankruptcy law (SchKG-Vereinigung/association LP). She is also a member of INSOL Europe.

Stéphanie Oneyser’s working languages are German, English and French. She is registered with the Zurich Bar Registry and admitted to practice in all Switzerland.

Significant Accomplishments

Chambers and Partners has moved Walder Wyss’s Arbitration Team up to Band 2 in its 2023 Global Ranking

Promotions at Walder Wyss

Lexology GTDT - Restructuring & Insolvency 2024 – Switzerland
Doing Business in Switzerland – A Practical Guide
Fehlerhafter Abschreiber im Schlichtungsverfahren: Wie(dererwägung) bitte?
Arbitration and Insolvency in Switzerland
Kommentar zu Art. 31–33, 34-35 und 37 SchKG
The Effects of the Brexit on the Lugano Convention – A Matter of Time
Doing Business in Switzerland – A Practical Guide
The Swiss Government declares a nation-wide standstill of deadlines for debt collection proceedings