An entrepreneur is an owner or manager of a business who takes on financial risk to launch new ventures. Some key entrepreneurs mentioned in the document include Sir Stelios Haji-Ioannou, who founded the low-cost airline EasyJet and other travel businesses; Eugene Schueller, who founded the cosmetics company L'Oréal; Estée Lauder, who built a cosmetics empire starting from selling creams from her uncle's hardware store; and J.K. Rowling, who became a billionaire author from her hugely successful Harry Potter book and film franchise.