Sébastien Vialar

Sébastien Vialar is a lawyer at the Paris Bar.
He advises French and international companies, investors, and executives to help them to prevent and resolve their disputes in corporate law and commercial law. He is particularly involved in corporate litigation and directors’ liability.

He has developed widely recognised expertise in the settlement of complex litigations in any forum (national courts and arbitration tribunals alike), in particular in conflicts relating to corporate financing (disputes between shareholders, M&A, acquisitions, private equity), commercial disputes and directors’ liability (civil, criminal, and disciplinary).

He advises, for each case, the most appropriate dispute resolution schemes, amicable dispute settlement procedure (negotiation, mediation, conciliation), or in any forum (including arbitration). He always strives to find customized solutions that enhance his clients’ profitability.

He also helps his clients identify, assess, and mitigate litigation risks.

Before joining Leonard Avocats in July 2025, Sébastien practiced in both UK/US and French firms (Dentons, Sarrau Thomas Couderc, Yards).

He is a member of APCEF (Association of Professionals in Economic and Financial Litigation).

University education:

  • Postgraduate diploma (DEA) in General Private Law, University of Paris X Nanterre – 1996
  • Specialized graduate degree (DESS) in International Business Law, University of Paris V René Descartes – 1997