Sibylle Vieille-Cessay

Associate

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Luxembourg

Tel: +352 28 57 95 3316

Overview

Sibylle Vieille-Cessay is a corporate associate and a member of the Investment Management Group. Ms. Vieille-Cessay joined Debevoise in 2025. Prior to ... Read Full Biography

Experience

- An investor group led by Trian Fund Management and General Catalyst Group Management in its $7.4 billion dollar acquisition of Janus Henderson Group.

Sibylle Vieille-Cessay is a corporate associate and a member of the Investment Management Group.Ms. Vieille-Cessay joined Debevoise in 2025. Prior to joining the firm, Ms. Vieille-Cessay worked at two leading international law firms in Luxembourg and Brussels as well as in-house in Luxembourg. Ms. Vieille-Cessay received an LL.M. from the University of California, Berkeley School of Law in 2014. She was awarded an LL.B., a Licence de droit and a Master 1 in 2013 through a dual-degree program in French and English law from King’s College London and Université Paris I Panthéon-Sorbonne.Ms. Vieille-Cessay is admitted to the New York State Bar, the Paris Bar and the Luxembourg Bar.Ms. Vieille-Cessay is fluent in English and French.