Harrisson's resignation comes just a week after W&K announced that it had poached Neil Christie, Euro RSCG London's marketing director, to be its new managing director.
Harrisson had been running the London office of W&K as its acting managing director since December, following the departure of Amy Smith, who resigned to return to her native Australia.
Barry Cook, the chairman and managing director of Leo Burnett, said: "2003 was, by necessity, a year of consolidation. 2004 is all about growth. I can't think of anybody better to help us with that objective than Camilla. Her combination of maturity, energy and enthusiasm is incredibly compelling. We are delighted that she has chosen to join us."
Leo Burnett has been largely absent from major pitches and a key part of Harrisson's remit will be to spearhead a new-business drive. The agency has not had anyone dedicated to new business since Sean Kelly left at the end of 2002. Following his departure, responsibility fell to the then managing director, Kate Howe, who left the agency in January last year.
Harrisson began her career in advertising at WCRS in 1994. She joined W&K in 2001 as its new-business director.
- Newsmaker, p14.