Guillaume graduated from the French business school HEC Paris (Grande Ecole) in 2015. He also received a Master’s degree in Business and Tax Law (Master 2 – Droit des Affaires et Fiscalité, with honors) in 2015 from the University of Paris I Panthéon-Sorbonne.
He is a member of the Paris Bar. His native language is French and he is fluent in English.