EssenceMediacom X was the incumbent agency.
Industry leaders weigh in on what Dentsu, Omnicom, Publicis Groupe and Interpublic Group results mean for media.
The global talent, transformation, client and media agency leader will leave in May.
The deal builds on a growing area for Publicis, which also acquired Influential last year.
The holding company is eying savings of $250 million ahead of its merger with Omnicom.
In Q4, Omnicom spent $14.6 million on 'acquisition transaction costs' related to its impending merger with IPG.
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