Sarah Warby has helped build Sainsbury’s into a marketing powerhouse, underpinned by its wealth of customer data from the Nectar loyalty scheme. Sainsbury’s won a Marketing Week Engage Award for Brand of the Year in 2013. Warby was appointed director of the 200-strong marketing team in 2012 because of what she achieved at Heineken. She started as a graduate trainee at Unilever and spent two years at agency Leo Burnett in Australia.