Louis Albert de Broglie, known as the Gardener Prince, is passionate about preserving biodiversity and promoting sustainable development. He owns Deyrolle, the fabled Parisian institution dedicated to nature, art, and education; Deyrolle is an official partner of COP21 and UNESCO. Emmanuelle Polle is a historian and journalist. She published Jean Patou: A Fashionable Life (Flammarion, 2013) and curated an exhibition on Christian Bérard at the Musée d'art moderne Richard Anacréon in Granville, France, in 2011.