Sonia was born in Paris. The family apartment in the 17th arrondissement houses the studio in which her parents, the photographers Barbara Rix and Jeanloup Sieff, worked. Photography was never a mystery to her, running as it did in her blood. She explores her own creative path through multiple visual disciplines: a photographer on film sets at the age of 20, then a portraitist, she also turned her attention to fashion photography.
She contributes to numerous magazines (VanityFair, Telegraph, Vogue) and works as a film-maker. Les Françaises is her first book.