Elon Reeve Musk (/ˈiːlɒn ˈmʌsk/; born June 28, 1971) is a South African-born Canadian-American business magnate, investor, engineer, and inventor. He is the founder, CEO, and CTO of SpaceX; co-founder, CEO, and product architect of Tesla Inc.; founder and CEO of Neuralink; co-founder and chairman of SolarCity; co-chairman of OpenAI; co-founder of Zip2; and founder of X.com, which merged with Confinity and took the name PayPal. As of March 2017, he has an estimated net worth of $13.9 billion, making him the 80th wealthiest person in the world. In December 2016, Musk was ranked 21st on Forbes list of The World's Most Powerful People.