Eccleshare will be responsible for all Clear Channel Outdoor's business outside the USA.
Each of Clear Channel's regional presidents, including Barry Sayer, regional president of Clear Channel in the UK, Ireland, the Middle East and Africa, will now report to him in his new role.
Eccleshare is understood to be in talks with both BBDO and Clear Channel about his exact leaving date.
The appointment of an experienced advertising leader is being interpreted by some in the industry as evidence the private equity owners of Clear Channel, Bain Capital and Thomas H Lee Partners, have a clear growth strategy for the business.
Eccleshare has 30 years' experience in the advertising and communications industry. Before joining BBDO, he was EMEA chairman and chief executive of WPP's ad network, Young & Rubicam.
Before joining Y&R in 2002, Eccleshare had a two-year sabbatical from advertising, when he worked as a partner at the management consultant McKinsey. Prior to McKinsey, Eccleshare worked at JWT and then at Ammirati Puris Lintas.
Eccleshare declined to comment and Clear Channel had not responded for comment before publication.
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