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Olivier HAFNER is currently working as a Human Resources Manager at Cellnex Telecom. Previously, they have held roles such as Human Resources Director at SNCF and Human Resources Manager at OUI.sncf and Thales Group. Olivier has experience managing various aspects of HR, including recruitment, training, development, compensation, and change management. They have a Master's degree in Human Resources from the University of Paris I: Panthéon-Sorbonne.