Ted Turner
Ted Turner
Turner Broadcasting

He parlayed his father's billboard company into the world's most influential cable news network, CNN. The first dedicated 24-hour cable news channel, CNN revolutionized the coverage of news around the world and made Turner, 73, a billionaire many times over.

By John A. Byrne, contributor @FortuneMagazine - Last updated March 22 2012: 6:02 AM ET
Join the Conversation
The 12 greatest entrepreneurs of our time

Great ideas are hard to come by. Putting them to work is even harder. Meet the founders who turned concepts into companies and changed the face of business.