Founder of Broadcast.com and Dallas Mavericks owner Mark Cuban has survived a recent run-in with the SEC, but that hasn't kept him from his oft-controversial blogging efforts.
The second-richest man in America and chief of investment titan Berkshire Hathaway doesn't just move markets with his advice: he also has his own online cartoon series, "The Secret Millionaires Club", which teaches kids how to invest their money wisely.
Often the target of parody on TV's "The Simpsons", Fox mogul Rupert Murdoch has acquired a vast media empire, with properties spanning across film, TV, print and the Internet.
Once rumored to be interested in buying the Los Angeles Times, philanthropist Eli Broad has his name all over Los Angeles with donations to schools, medical research and art collections.
Activist investor and financier Carl Icahn is best known for his very vocal roles in management fights over firms like Time Warner and Yahoo.