However, Brooks, who was previously the chief human resources officer at WPP, will continue to act as a consultant to Interpublic.
An Interpublic statement said: "The change was prompted by Brooks' desire to focus exclusively on talent management and recruitment ... while stepping away from the administrative responsibilities involved in heading the human-resources function of a multinational company."
Interpublic sources suggested that Brooks' bullish style did not suit the network at a time when it has been more process driven because of the scrutiny it faces from regulators.
His tenure also coincided with a turbulent time for the network, which has recently lost key personnel including Jim Heekin, the chairman and chief executive of McCann-Erickson Worldgroup; Ben Langdon, the regional director of McCann-Erickson Worldgroup, and Tom Bernardin, the chief executive of Lowe in New York.
Brooks, 48, joined Interpublic in November 2002 after ten years at WPP.
David Bell, Interpublic's chairman and chief executive, said: "We are fortunate, both at the Interpublic level and within our operating companies, to have Brian available to us as a resource."
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