Mark Cuban is a serial entrepreneur, investor, and owner of the Dallas Mavericks. His career began with his founding of MicroSolutions, a company he went on to sell to CompuServe in 1990. Then in 1995 Mark co-founded Broadcast.com - streaming audio over the internet. In just four short years, Broadcast.com (then Audionet) was sold to Yahoo for $5.6 billion dollars. Following the acquisition in 2000, Mark acquired the Dallas Mavericks where since his taking over they have competed in the NBA Finals for the first time in franchise history in 2006 - and becoming NBA World Champions in 2011. They are currently listed as one of Forbes' most valuable franchises in sports. If that was not enough, Mark is also one of ABC's "Sharks" on the hit show Shark Tank.