Mark Halliday is the Director of Programmatic UK at JCDecaux, where he leads the strategic development, commercial growth, and innovation of programmatic out-of-home (pDOOH) across one of the world’s largest outdoor advertising networks. In this role, Mark is responsible for accelerating the adoption of data-driven, automated buying solutions and strengthening JCDecaux’s position as a pioneer in the future of outdoor advertising. With extensive experience in digital media, programmatic strategy, and advanced advertising technologies, Mark has played a pivotal role in shaping how brands access high-impact OOH inventory through addressable, audience-led, and real-time activation. He works closely with advertisers, agencies, and technology partners to create scalable, measurable, and creative programmatic solutions that make outdoor media smarter, more flexible, and more effective.