Fennemore will start the newly created role in September. He will work with the agency’s key clients including Disney, Gillette and Dairy Crest.
Sophie Daranyi, chief executive at Haygarth, said: "Alex’s retail experience will prove invaluable in planning campaigns for our retail clients."
Other recent appointments at the agency include digital creative Leroyson Figuiera. It recently won briefs from The Learning Skills Council and Walt Disney Studios DVD.