Elon Musk a South African-born, Canadian-American business entrepreneur, investor, inventor, and engineer. Oh, and he's worth an estimate £9.5 billion. Why? Well, Musk never seemed to stop expanding his business horizons. This primarily started in co-founding PayPal in 1999, but soon progressed to founding SpaceX in 2002, a private company with the intention of manufacturing spacecraft for commercial space travel. Furthermore, just a year later he had also co-founded Tesla Motors, a company whose sole ambition was to produce all-electric cars. Despite some large failures, including three unsuccessful rocket launches, Musk continues to invent, promising to send humans to Mars by 2031. One of his famous quotes is, ''failure is an option here. If things are not failing, you are not inventing enough''