Helen Miall - Chief Marketing Officer, VIOOH As CMO at VIOOH, the leading premium digital out of home (DOOH) supply side platform, Helen is responsible for global marketing strategy, thought leadership and supporting the expansion and adoption of programmatic DOOH worldwide. She is committed to helping the OOH industry transition to audience-led and programmatic trading, maximising the opportunities for OOH with the wider digital media landscape. Helen has previously held senior marketing roles at Parkopedia, O2 (Telefónica UK), Turn, and Microsoft Advertising. Whilst at adtech company Turn, Helen set up and ran marketing across the EMEA region, helping grow programmatic display from c10% to a majority share of market spend. Helen spent the first 9 years of her career in various marketing roles at United Airlines and Air France.