Omnicom's PHD has hired Nathan Brown from rival media agency UM to become its CEO, PHD said today. Mr. Brown succeeds Robert Habeck, who was moved up to a new role as president-global accounts, North America, at Omnicom Media Group.

Mr. Brown's departure from UM, where he was exec VP and managing director, is the latest management change at IPG Mediabrands, the media division of Interpublic Group. Jacki Kelley, former CEO for North America and president of global clients, left in June to join Bloomberg Media. She had been offered a new role within parent company Interpublic in May.

Subsequently, Kristi Argyilan -- then North America President of Magna Global, Mediabrands' digital buying arm -- moved to a senior VP-media and guest engagement position at Target.

In a statement, Page Thompson, CEO, Omnicom Media Group North America said, "Nathan has a proven track record in creating and delivering great media product that is rooted in strategic insight, and inspiring performance that wins and retains clients -- a combined skill set that has translated to aggressive business growth,"

Mr. Brown will assume his new role October 1.

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CORRECTION: An earlier version of this article misstated Ms. Argyilan's title at Target. She is senior VP-media and guest engagement, not VP.