He's the man behind Tesla Motors Inc. (Nasdaq: TSLA), SolarCity Corp. (Nasdaq: SCTY), and PayPal, but despite his fame, many still ask themselves "Who is Elon Musk?"
The quote from Musk's 2013 "TED Talks" interview gives a glimpse of the $7 billion man and what has driven him in his career.
"It goes back to when I was in University, I thought about what problems are most likely to affect the future of the world," Musk said. "I think it's extremely important that we have sustainable transport and sustainable energy production. That overall sustainable energy production is the biggest problem we have to solve this century."