Carpenter, who will work primarily on the agency's recently captured £75 million BT business, joins Maxus from Starcom MediaVest Group, where he headed TV buying on the same account.
Maxus landed the BT business from Publicis' VivaKi in February after a benchmarking exercise involving several media networks. The WPP agency officially takes on the BT business from this Thursday (1 April) just two years into a three-year contract that was agreed between BT and Publicis in 2008.
Carpenter joins Maxus following a period of leave from Starcom that coincided with the final stages of contract negotiations between BT and competing agencies for the business. He has had a long relationship with BT, having previously been the broadcast director at The Allmond Partnership, the now defunct agency that handled BT's TV buying before Starcom.