NET WORTH: $13.9 billion, up 45 percent

LAST YEAR: $9.57 billion

AGE: 43

RESIDENCE: Bel Air

SOURCE OF WEALTH: E-commerce, electric vehicles, space exploration, solar power

THE MONEY: Tesla shares rebounded from prolonged slump after an April tweet from Musk announced a new, noncar product was on its way. The market value of Space Exploration Technologies Corp. (SpaceX) tripled after an investment from Google Inc. and Fidelity Investments.

BUZZ: Musk continues to be one of the most fascinating and forward-thinking entrepreneurs in world. A PayPal co-founder, the South Africa native set social media ablaze in late March when he announced Tesla Motors would unveil a new product line at end of April. It was revealed to be a battery capable of powering an entire home. Observers are bullish on Tesla’s prospects as it plans to start selling its Model X SUV in third quarter. One analyst predicted SUV sales could drive the company’s stock to $280. The upcoming Model S autopilot feature may give Musk an advantage over competitors in the race to produce world’s first driverless car. The value of SpaceX reached $10 billion after a January investment from Google and Fidelity. The company has failed to successfully land its Falcon 9 rocket on floating platform in Atlantic Ocean. SpaceX has $1.6 billion contract with NASA to resupply International Space Station and there are plans to ferry humans one day, too. Musk told Bloomberg he hoped to build a communications network in space capable of bringing the Internet to future colonists on Mars. After marrying English actress Talulah Riley for second time in July 2013, the couple split again in December.