Julien Dossier is the founder of Quattrolibri, an innovation consultancy on transition strategies. An expert in carbon neutrality, Julien has co-authored the Paris carbon neutrality strategy. He published the post-carbon strategy of the wider Fontainebleau area, took part in the national research programme Rethinking Cities in a Post Carbon Society, and co-authored climate adaptation plans for several French cities. He advises private clients on their transition strategies in a wide range of sectors: construction, high-tech, consumer goods, transportation, finance, and solar panel manufacturing. He teaches sustainable cities at HEC Paris, is a member of the paysages de l’après pétrole research group and the author of Chiche! (2018).