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WPP’s media network GroupM announced today that Tim Castree would be its new CEO for North America, filling a position left empty since Brian Lesser left approximately 16 months ago to help oversee AT&T’s ad platform.
Castree formerly served as global CEO of Wavemaker, the product of a 2017 merger between media agencies MEC and Maxus that sought to counter the turn toward commoditization in ad-buying services. Over the past year, he also assisted GroupM global CEO Kelly Clark in “reimagining the future” of an organization that provides a majority of WPP’s revenues in its largest global market—and that side project, Castree said, led Clark to assign him the North American leadership role.
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