White joins from Yahoo where he was agency group head, responsible for all display and search business with WPP agencies.
He joined Yahoo in 2008 as head of mobile, search and display advertising and held his current role for just over a year and a half. Prior to Yahoo he worked at Channel 4 as mobile advertising manager.
In July Yahoo hired Disney’s Steve McHenry to replace White, following a UK restructure at the digital media business.
Quantcast has created the new role to offer its agency clients strategic advice in the ad tech market.
White will report into Phil Macaulay, managing director of Quantcast UK and starts at the company on Monday.Follow @shearmans