Born in Paris on 3 January 1964, Hieronimus’ father was a television producer and his mother an engineer in the aerospace sector.

[5] He attended ESSEC Business School in 1981, graduating in 1985 with a degree in marketing.

[1][7] As marketing director at Garnier Laboratories in the 1990s, he created, developed and launched the Fructis haircare and Movida hair color ranges.

[9] After becoming head of L'Oréal Mexico in 2005, Hieronimus became general manager of the Professional Products Division in 2008.

[10] In January 2011, he was named President of L’Oréal Luxe, which he helped to transform by upgrading and modernizing its major brands, and by focusing on consumer experience, service and retail.