James Rosewell

Co-founder & CEO at Movement for an Open Web

Rosewell's regulatory interventions have materially affected the timeline and design of Privacy Sandbox, making him one of the most consequential non-C-suite figures in the identity/privacy space despite being outside mainstream US AdTech coverage.

Last updated May 25, 2026 by jonholm

Bio

James Rosewell is a UK-based AdTech entrepreneur and co-founder of Movement for an Open Web, an industry group that has filed formal complaints against Google's Privacy Sandbox with the UK Competition and Markets Authority. His advocacy work has directly shaped regulatory scrutiny of Google's cookieless transition and influenced CMA oversight.

Expertise

Privacy RegulationOpen Web AdvocacyCompetition Policy