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The role involves leading the agency's data strategy function.

The news follows the agency's acquisition by Canadian loyalty company Groupe Aeroplan, owners of Nectar, a deal set to complete in December.

Christison, who worked at Carlson early in her career, will work closely with Guy Culshaw, planning director, across all Carlson clients includng RBS, Coca-Cola, Hyundai, COI and Nestlé.

At OgilvyOne, Christison was senior director of marketing analytics, where she worked on brands such as British Airways and DHL.

 Her career began client-side, working for American Express and Abbey National, creating customer databases and campaign management software. 

She then moved across to work in agencies such as BBH, TBWA and LIDA, where accounts included Vodafone, MINI, COI, RAF, NatWest, Heinz, Sporting Bet, Porsche and The Mirror.