Omnicom Group, parent company of global advertising agency network TBWA, has announced the appointment of Troy Ruhanen as the agency’s new global president and CEO. Ruhanen, who joins from Omincom, succeeds Tom Carroll who will continue as chairman of TBWA Group. Previously Ruhanen was responsible for driving cross-agency collaboration for Omnicom's largest clients. Prior to this he held several senior management roles at other Omnicom Group agencies, including chairman and CEO, the Americas, BBDO Worldwide.