Havas Media names James Olney global head of effectiveness

Havas Media has appointed James Olney as its new Global Head of Effectiveness, a senior leadership role focused on measurement, analytics, and demonstrating the tangible business impact of media investments for clients. This appointment signals Havas Media's continued strategic investment in effectiveness capabilities at a time when advertisers are under increasing pressure to justify media spend and prove return on investment. Olney's role is expected to oversee the development and deployment of effectiveness frameworks, tools, and methodologies across Havas Media's global network of agencies and markets.

This leadership appointment reflects a broader industry trend among major media agency groups to elevate measurement and effectiveness as a core strategic competency rather than a back-office analytics function. As the AdTech ecosystem grapples with signal loss from cookie deprecation, privacy regulations, and fragmented media environments, agencies that can credibly demonstrate campaign effectiveness and business outcomes hold a significant competitive advantage. Havas Media's move to install a dedicated global effectiveness leader positions it to compete more directly with rivals such as GroupM, Publicis Media, and Dentsu, all of which have made similar investments in measurement leadership and proprietary effectiveness tools. This also aligns with growing client demand for media accountability and incrementality-based measurement approaches.