The restructure of the agency has undergone a series of promotions and appointments in the UK as part of an initiative by Linda Smith, chief executive.
Roberts is understood to have been offered other roles within the network, but has decided to seek fresh opportunities.
Starcom is set to refocus its structure, with a shift towards the burgeoning digital sector under Smith, who joined the agency in December 2005, alongside a major investment in new data management staff and systems.
Recent changes have included the appointment of former Nylon partner Pru Parkinson as group strategic planning director responsible for core product offering, strategic research and insight, marketing and new business.
John Davidson, the TV buying director for Starcom MediaVest, has also been appointed as UK group TV buying director. Chris Williams, Starcom's TV buying director, had been offered at least two other opportunities at the agency, but is understood to have declined both.
Neil Allen, who joined as Starcom MediaVest press director from Mediaedge:cia, was promoted to UK trading director of press last month. Adrian Pike stays in his role as Starcom press director.
At Starcom Digital, director Nigel Sheldon has taken up the role of strategic planning director for digital, while Andrew Smith, head of direct, becomes head of operations. Digital and direct operations will now be under the same roof.
John Baylon, TV group director, has been appointed digital account director at Starcom Digital. However, Adrian Carpenter will continue running the BT TV buying business.
The agency has recently picked up the £7m Caterpillar clothing account, along with successfully defending the £20m UK InBev account.
Last month, the agency managed to pick up two multimillion-pound accounts. First the agency picked up the £15m Premier Foods account, snatching the business from joint incumbents Walker Media and ZenithOptimedia. The brief include Campbell's and Premier Foods brands such as Ambrosia and Branston Pickle.
Topping off the year, the agency then was awarded the £32m media planning and buying account for EMI Records after a five-way pitch including incumbents Carat and Media ±±¾©Èü³µpk10, as well as MindShare and the7stars.
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