It is thought that Saatchis' worldwide chief executive, Kevin Roberts, under pressure from Publicis, the parent company of the network, is
attempting to streamline his senior management, prepare his succession plans, re-energise the network and ensure all new business is handled by local managers.
Bishop, an agency "lifer", is widely credited with revamping Saatchis' New York office in 1994, but returned to the UK office to become the chairman. He went back to New York in 1998 when the newly appointed Roberts gave him his current job. He was not replaced as chairman in the UK.
Cullinane left the New York office before Christmas. Previously the head of Saatchis in Australia, he was one of the team that persuaded Roberts to leave his client-based job at the brewer Lion Nathan to take the top role at Saatchis.
Cullinane's departure is said to be connected with the fact that he was not regarded as a contender to succeed Roberts at the head of the
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