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Gillian Collison is an experienced marketing professional specializing in social media, currently serving as Executive Director and Global Head of Social at GroupM since April 2022, with a recent acting role as Global Head of Social from November 2023 to March 2024. Previously, Gillian held leadership positions at MediaCom, overseeing paid search and social strategies for major clients such as JP Morgan Chase and Reebok. Early experience includes significant roles at Mindshare, leading social media strategies for clients like Bupa and HSBC, and positions at We Are Social, Appliances Online, and Meltwater Group. Gillian holds a Bachelor of International Business and Languages in Marketing from the University of New England and participated in an International Exchange Program focused on Language Interpretation and Translation at Université Jean Monnet Saint-Etienne.