Ségolène Gallienne is a Director of various French and international companies (including Christian Dior, SC Château Cheval Blanc, Pargesa and GBL) and Chairwoman of the Board of Directors of Diane S.A., a company specialised in the trading of art works.

She was previously Head of Public Relations at Belgacom (which became Proximus) and Head of Communication at Dior Fine Jewelry.

Ségolène Gallienne holds a Bachelor in Business and Economics from Vesalius College in Brussels, Vrije Universiteit (VUB).