WFA chief Stephan Loerke on brand safety, GDPR and what makes a top marketer today

The World Federation of Advertisers (WFA) and The Drum have partnered to find the next Global Marketer of the Year. As the 30 September deadline for entries nears, The Drum caught up with WFA chief executive Stephan Loerke to find out what’s leading the global marketing agenda and what he believes makes a top marketer today.
What would you say is the biggest challenge facing global marketers today?
People - the decreasing trust by people in digital marketing. It's the mother