He joins the agency from Saatchi & Saatchi in Jakarta, where he spent two years as the chief executive.
Roebuck will report directly to the chairman and chief creative officer, David Ortega, who said the appointment was critical to the agency's growth strategy as it builds on its position as a regional hub for clients such as FedEx, Visa and Pepsi.
Before joining Saatchis in Jakarta, Roebuck worked for the agency in Malaysia, South Africa and the UK.