Dame Natalie Sara Massenet, DBE (née Rooney; born 13 May 1965) is a British-American fashion entrepreneur and former journalist, who founded the designer fashion portal Net-a-Porter. From 2013 to 2017, she was the chairman of the British Fashion Council. In 2018 alongside Nick Brown, she co-founded Imaginary Ventures and became non executive co-chairman at Farfetch. Credited by many as changing the way designer fashion is retailed, she has been described by The Observer as: "fashion's favourite self-made success story".