John Halley

John Halley is President of Publicis Media, the media solutions division of Publicis Groupe that encompasses agency brands including Starcom, Zenith, Spark Foundry, and Blue 449. In this capacity, he oversees strategic direction and operational leadership for one of the largest media investment organizations in the world, managing tens of billions of dollars in annual media spend across global markets. His tenure has been defined by accelerating the group's capabilities in programmatic advertising, data-driven media planning, and AdTech platform partnerships. Halley has been a central figure in Publicis Media's push to integrate technology and data more deeply into media buying operations. He has championed the adoption of advanced audience targeting solutions, identity resolution frameworks, and measurement innovations that align with the industry's evolving privacy landscape. His leadership has helped position Publicis Media's proprietary data platform, Epsilon, as a differentiating asset for clients seeking addressable and accountable media investment strategies. Before ascending to the presidency of Publicis Media, Halley held senior leadership roles within the organization, including as Chief Operating Officer, where he built operational infrastructure and drove efficiency across the holding company's media brands. His career reflects a deep understanding of both the business and technology dimensions of modern media, making him a key operator in the AdTech and media agency ecosystem.

• Led Publicis Media as President overseeing a portfolio of major agency brands managing tens of billions in annual global media spend
• Drove integration of Epsilon data platform across Publicis Media agency brands to enable addressable advertising at scale
• Oversaw programmatic and AdTech capability buildout across Starcom, Zenith, and Spark Foundry