Elon Reeve Musk (; born June 28, 1971) is a South African-born Canadian-American business magnate, engineer, inventor and investor. He is the founder, CEO and CTO of SpaceX, co-founder, CEO and product architect of Tesla Motors, chairman of SolarCity, co-chairman of OpenAI, co-founder of Zip2, and co-founder of PayPal. As of January 2016, he has an estimated net worth of US$12.4 billion, making him the 39th wealthiest person in the US.