Businessman, investor and philanthropist Mark Cuban was an entrepreneur from the early age of 12, when he sold garbage bags door-to-door. Today, Mark is the highly successful entrepreneur and investor who founded HDNet, Broadcast.com and MicroSolutions. He has also been an investor in startups, including Mahalo, JungleCents.com, motionloft.com, Filesanywhere.com, Naked Pizza and 140Fire.com. He appears on the television series Shark Tank and wrote the book “How to Win at the Sport of Business.”