Karl Heiselman, Global CEO of branding agency Wolff Olins is set to leave his position to join Apple in a marketing communications role, reports Ad Age. The move comes as Apple works to double the size of its in-house creative design team as competition from Samsung and Android heats up. Mr. Heiselman confirmed by email that he accepted "an exciting new role at Apple after 14 fantastic years at Wolff Olins," but referred further questions to Apple. An Apple spokeswoman declined to comment.