Since the age of 12, Mark has been a natural businessman. Selling garbage bags door to door, the seed was planted early on for what would eventually become long-term success. After a dispute with an employer who wanted him to clean instead of closing an important sale, Mark created MicroSolutions, a computer consulting service. He went on to later sell MicroSolutions in 1990 to CompuServe. In 1995, Mark and long-time friend Todd Wagner came up with with Broadcast.com - streaming audio over the internet. In just four short years, Broadcast.com (then Audionet) would be sold to Yahoo for $5.6 billion dollars. Since his acquisition of the Dallas Mavericks in 2000, he has overseen the Mavs competing 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. In addition to the Mavs, Mark first appeared as a "Shark" on the ABC show Shark Tank in 2011, becoming the first ever to live Tweet a TV show. He has been a star on the hit show ever since and is an investor in an ever-growing portfolio of small businesses.