WhiteGrey has been left without a CEO as Miles Joyce leaves the business.
His exit comes only weeks after joint-CEO Paul Worboys resigned due to "family reasons".
John Steedman, WPP executive chairman of media investment and specialist businesses, will take on the role of acting CEO.
WPP has issued a statement confirming the move: "Following a discussion with Miles Joyce about the direction for WhiteGrey moving forward, we have agreed that a change of leadership is required and as such Miles has left the business.
"The search for a new CEO for the business is underway and an announcement about an appointment will be made in the coming weeks."
Worboys and Joyce
Joyce led The White Agency for a decade before becoming WhiteGrey joint-CEO last year when the agencies merged, a title he shared with Worboys.
He also founded NetX back in 1999, which was later acquired by Clemenger.
Veteran media industry operative Steedman finished-up at GroupM in June 2015 as CEO and executive chairman and went onto join the board of the combined WPP/STW entity in 2016.
Steadman will work alongside Kate Walker, WPP group client director, to lead the business and its team throughout this transition period.
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