Paul-Olivier Dehaye is the founder of PersonalData.IO, a nonprofit focused on making data protection rights individually actionable and collectively useful. He is interested in collaborative sensemaking of personal data ecosystems through mapping and engagement of civil society. As a mathematician, he is also keenly interested in ensuring we have proper processes in systems in place to hold algorithmic systems and their creators accountable. It is what attracted him to investigate the firm Cambridge Analytica, for which he appeared in the documentary The Great Hack. He also sits on the board of MyData Global, a nonprofit working on personal data empowerment.