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Sebastiano Nessi, LL.M., ArbP

Senior Associate

Schellenberg Wittmer Ltd
15bis, rue des Alpes

P.O. Box 2088

1211 Geneva 1

T +41 22 707 8000
F +41 22 707 8001

French, English, German, Spanish

T +41 22 707 8000
F +41 22 707 8001

Sebastiano Nessi is a Senior Associate in our International Arbitration Group in Geneva. Trained in both civil and common law, Sebastiano has advised and represented clients in numerous arbitrations, both ad hoc and under each of the major institutional rules. Sebastiano also sits as an arbitrator.

Practice Areas / Sectors and Industries

Expertise and Experience

  •  Has acted as counsel for Swiss and international clients (including states and state-owned entities) in a range of complex (commercial and investment) arbitrations, both ad hoc and under each of the major institutional rules, with seats in Geneva, London, New York, Paris, Singapore, Stockholm and Vienna
  • Has  represented clients on a range of court applications before Swiss courts including the Swiss Supreme Court
  • Has advised clients on the structuring of their investment and states on the negotiation and drafting of trade and investment treaties
  • Has a broad range of expertise with a particular focus on energy, oil & gas, commodities, pharmaceuticals, sales and distribution, banking, aerospace, construction and sports disputes
  • Sits himself as an arbitrator 


Professional Experience
Senior Associate at Schellenberg Wittmer
Senior Associate at Allen & Overy LLP, Paris
Associate in a major Swiss law firm in Geneva

Education and Admission
Certificate of Advanced Studies in arbitration, Universities of Lucerne and Neuchâtel
Arbitration Practitioner (ArbP) Diploma, Swiss Arbitration Academy
Master of Laws (LL.M.), Columbia Law School, New York
Bar Admission in Switzerland
Master of Law, University of Geneva

Additional Professional Activities
  • Author of more than 40 publications in the field of arbitration
  • Lecturer on investment and commercial arbitration at Sciences Po Law School and the University of Paris I, Panthéon-Sorbonne
  • Member of several professional associations, including the Swiss Arbitration Association, ASA below 40, the LCIA, YIAG, ICDR Young and International, ICC YAF, RAA40, CEPANI 40, CFA40, and DIS 40


  • Who's Who Legal Future Leader in Arbitration (2018)
  • Winner of the 2005 Geneva Bar Rhetoric Art Contest (Concours d'art oratoire Michel A. Nançoz)

„"very quick on his feet", "smart", and praised for "his ability to adapt himself to an array of different circumstances, environments and mentalities from a global perspective"“

Who's Who Legal Future Leaders in Arbitration (2018)