PREVIOUS APPEARANCES ON THE TIME 100: 0
PRO: As owner of the Dallas Mavericks, he cleaned house last year, firing coach Avery Johnson and picking up point guard Jason Kidd. But fans are reserving their judgment until they see if Cuban can bring the team back to the finals.
CON: Last fall, the SEC charged him with insider trading, and in January he received his umpteenth NBA fine, this time for yelling at a player. He also made Erick Dampier a gazillionaire. Nice move!