Within days of DDB Australia and New Zealand chairman and CEO Marty O’Halloran landing the global CEO role last week, he made a radical move to appoint a black, data-led CEO, Justin Thomas-Copeland, to the North American advertising institution. In this conversation, O’Halloran admits it’s a signal for the DDB world that he will shake things up. John Wren, the boss of DDB’s giant NY-listed parent company Omnicom, says if O’Halloran can replicate the performance of the Australian and New Zealand group internationally, they’re going to “have a great time together”. Here’s what the low-profile O'Halloran says he’s going to do.