Review concludes after an eight-month competitive process.
Grey will split from AKQA as part of the move.
Campaign charts the WPP media arm's history amid ongoing change under global chief executive Brian Lesser.
'Silicon Valley’s favourite ad man' is honoured by friends and colleagues.
The appointment follows a closed process across several global markets.
Substantial planned media investments will be made in over 100 markets including Southeast Asia, South Korea, and India among others.
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