Gregory started his career in 1997 as a strategy consultant at Oliver Wyman. In 2006, he joined the online agency Promovacances as Strategy and Partnerships Director. In 2009, Grégory Sion joined HomeAway, successively as CEO of Abritel.fr (France), CEO of BedandBreakfast.com (Austin - USA) and CEO of HomeAway UK (London - UK).

Gregory joined Pierre & Vacances CenterParcs as Chief Digital & Commercial Officer in 2016, where he introduced a customer centric & innovation based approach, leading to a substantial Sales growth.

Grégory Sion graduated from Ecole Centrale.