Communication Corporate & Leadership Thought. Duval Union is a corporate communication and public relations agency specializing in the accompaniment of executives and large companies. The agency excels in the personal branding of leaders, financial communication and institutional image management. Duval Union helps managers build and amplify their voices in public space and on professional social networks such as LinkedIn. Their expertise in content strategy and media relations enables them to position their clients as leading think leaders in their industry. It is the partner of listed companies and executives who want to structure their communication of influence.