
Marks will work on the agency's Fiat and Alfa Romeo account, which shifted out of sister WPP agency Mediaedge:cia and into Maxus last year. She will report to Maxus joint managing director James Jennings.
Marks ran the Carphone Warehouse account at MCHI, and before, that was a media director at PHD for seven years, running the Sainsbury’s, Harrods, Heal’s and The Economist accounts.
Lindsay Weedon, chief executive of Maxus, said: "We’re delighted that someone of Stephanie’s calibre is joining Maxus. She forges fantastic client relationships, is a great team player, and will be a valuable addition to the expanding Maxus team."