Katerina Philippou

Katerina Philippou serves as Programme Manager for Privacy Sandbox at Google, where she plays a central role in one of the most consequential transitions in digital advertising history — the industry's move away from third-party cookies toward privacy-preserving alternatives. Her work sits at the intersection of browser-level technical standards and the practical operational realities faced by publishers, advertisers, and ad tech vendors navigating this shift. Philippou is an active participant in W3C technical working groups, including those focused on advertising and privacy, where she contributes to the development and refinement of Privacy Sandbox APIs such as Protected Audience, Attribution Reporting, and Topics. In this capacity, she serves as a critical liaison between Google's engineering and policy teams and the broader AdTech ecosystem, helping translate complex technical proposals into actionable guidance for industry stakeholders. Her role has become increasingly prominent as cookie deprecation timelines have evolved and industry scrutiny of Privacy Sandbox has intensified. She engages regularly with trade bodies, publishers, and ad tech companies to gather feedback and communicate updates, making her a recognizable figure in W3C proceedings and industry forums focused on privacy-preserving measurement and targeting.

• Active contributor to W3C Improving Web Advertising Business Group and related technical working groups
• Programme management of Google's Privacy Sandbox initiative, coordinating cross-industry feedback and API development timelines