[1] His older sister, opera singer Gaëlle Méchaly, studied music at the same conservatoire.
[2] Méchaly began his career as a composer for television shows and commercials for French media conglomerates.
[3] He wrote his first score for French-Israeli writer and director Raphaël Nadjari's 2004 film Avanim.
Eventually, the French production company EuropaCorp's music department director became aware of Méchaly's earlier works and commissioned him to compose French actor Richard Berry's 2005 directorial feature film The Black Box.
French screenwriter and director Luc Besson, co-founder of EuropaCorp was pleased with Méchaly's work in The Black Box and decided to hire him for future projects.