South African entrepreneur Elon Musk is best known for founding SpaceX, PayPal and Tesla Motors, the company that created the first modern-day electric car. He acts at CEO and Chief Designer of SpaceX, CEO and Product Architect of Tesla Motors and Chariman of SolarCity. He recently purchased a $17 million mansion in Bel Air.

She’s the founder and chairman of the online luxury fashion retailer, Gilt Groupe. Through its exclusive, discounted online sales events, Gilt Groupe single-handedly changed how people shop. The company has seen exponential growth in the past year, branching out from fashion to other luxury goods sectors, and has launched the city-specific deal website, Gilt City.