Sorrell, who has been CEO of the world’s largest advertising group for the last 33 years, said it is in the “best interests of the business” that he steps down now.

Snap has this week hired Facebook’s director of agency partnerships, Ed Couchman, as its new general manager for the UK – while promoting Claire Valoti.

Facebook CEO Mark Zuckerberg has answered questions from US Senators this week about data privacy practices in the wake of the Cambridge Analytica scandal. Here, experts share their views on what this means for adland.

Based in its London office, Manning will focus on international expansion for the Ascential company, and joins after a decade working for Ebiquity, where he was chief strategy officer.

In her new role, Stevens will work across Zenith’s portfolio of global clients and will be responsible for defining Zenith’s overall direction in commerce services.

In the wake of the Cambridge Analytica and Russian election scandals – and just before its CEO is to testify before Congress – Facebook has announced plans to crack down on unauthorised political or ‘issue ads’.

EVENT: Hear from the most engaging research practitioners and users, ensuring insights that will enhance how your business sources and uses data to drive success.

In his new role, Barnett will drive the product vision and strategy across Quantcast’s Advertise and Measure businesses.

Dal Gill joins Seedtag from Spotify, where he served as a member of the European leadership team.

Andrew Mortimer, Sky’s director of media, has this week moved from the marketing group to the newly-created role of director of client strategy for Sky Media.