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David A. Guillerm is a seasoned consultant and trainer in e-commerce and digital marketing, currently associated with Littoral Digital since September 2023. With 13 years of experience in e-commerce and web marketing, particularly within the French retailer Le Comptoir Irlandais, David has developed a diverse expertise spanning independent consulting, the cultural sector, and commerce. As a founding member and project strategy manager for Collectif Excalibur and a founding member of Collectif E-CO, David advocates for sustainable societal transitions through dialogue and collaboration. Additionally, David serves as an instructor at Brest Business School, focusing on marketing and corporate social responsibility initiatives. David holds a Master 2 in Marketing from Brest Business School and a Bachelor's degree in Commerce et Management from Ecole supérieur de commerce de Brest.