Publicis’ Leo Burnett has hired Paul Shearer and Jim Thornton as co-executive creative directors in its London office, the agency said last week. A start date has yet to be determined. Thornton, 40, will join the shop from Mother in London, where he is creative director. Shearer, 36, is a creative director at Wieden + Kennedy in Amsterdam. They replace Nick Bell, who left Burnett in February to take a similar post at WPP’s J. Walter Thompson in London.