Elon Musk has a lot going on. And it may be coming at the expense of his core business — Tesla. Let's go back to the company's start. Tesla was founded by friends of Musk in 2003, just one year after Musk started SpaceX. But Tesla's mission to bring electric cars to the masses was one he couldn't pass up. In 2004, he led the company's fundraising efforts as Tesla's chairman. In 2006, Musk invested $10 million in his cousin's solar energy company, SolarCity. And Tesla unveiled the first Roadster model. It was touted as a symbol of the future of "green" sports cars, but Musk had an even bigger vision for the brand. Just days after the Roadster unveiling, he revealed his master plan for the company. He wanted to build more affordable cars and use Tesla to co-market other sustainable energy products. Like solar panels from SolarCity.

SolarCity Corp. employees unload solar panels from a truck Michael Nagle | Bloomberg | Getty Images

So at this point, Musk was running SpaceX during the day, coming up with Tesla's business and product strategy on the side and managing a multimillion-dollar investment in Solar City. In 2008, Musk had taken over Tesla Motors as CEO, and Tesla Roadsters had hit the production line. But the company wasn't immune to the financial crisis. With literally minutes left to spare on Christmas Eve, Musk secured enough money to keep the company afloat. In 2010, Tesla went public, and Musk's ambitions continued to grow. In 2012, his net worth hit $1 billion. And in 2013, Musk unveiled a design for a new kind of transportation system called Hyperloop. It would use vacuum tubes to suck pods containing passengers at speeds of up to 600 mph. Although Musk didn't create a company, engineers from Tesla and SpaceX teamed up to release the designs publicly. By this point, he was juggling SpaceX, Tesla, SolarCity and the Hyperloop project.

Source: Hyperloop One