Alex Grieves is the Head of Programmatic at billups, the leading independent out-of-home (OOH) agency, helping advertisers, agencies, and OOH media owners strengthen media performance through a patented analytics and measurement platform. Based in London, Alex leads billups’ programmatic strategy, enhancing audience-first planning, activation, and measurement across digital OOH. Before joining billups, Alex held leadership roles at GroupM, where he specialized in programmatic OOH and launched multi-market operations from London.