Elon Musk is a South African-born American industrial engineer, entrepreneur, who co-founded Paypal and founded aerospace transportation services company SpaceX. He is also one of the early investors in Tesla, an electric car company, and now the Chief Executive Officer of the firm as well. With a $70.5 bn fortune, Musk sits comfortably at the 7th spot in the world’s top 10 billionaires list.