One year ago, Mediabrands signed on as the charter agency partner for AOL's ONE platform, and began using that platform to automate data across display, mobile, video and linear TV.
But Mediabrands has suffered some big client losses recently, on Seiler's watch. The most stinging setback was the loss of Microsoft's media business last year following an integrated pitch with IPG global network Universal McCann (McCann won the creative business).
Michael Roth, chairman and CEO of Interpublic, said in a statement, "Today's announcement is part of a long-term game plan and a natural evolution for the management team. It acknowledges Matt and Henry's contributions to the agency's achievements and positions them to focus on specific areas in which they can both continue to make key contributions to Mediabrands and IPG going forward."