Kate Middleton’s personal assistant is bowing out. After 15 years as the Princess of Wales‘ right-hand woman, Natasha Archer is embarking on a new business venture. The 37-year-old is leaving her role at the palace to establish a private consultancy,

Archer helped usher Kate from girl-next-door to regal style icon, championing high-end designers such as Alexander McQueen and Jenny Packham. The so-called ‘Kate Middleton Effect’ — the phenomenon of fashion items selling out after she wears them — is estimated to contribute $1.27 billion a year to the U.K. economy.

Natasha Archer, credited with finessing the princess’s signature high-low look, is striking out on her own after 15 years at Kate’s side.