At a time when women couldn't vote or freely enter the workplace, Ida Tarbell took on the richest man in America and triumphed. Ida grew up in the Pennsylvania oil fields of the 1870s, and saw how John D Rockefeller and his company Standard Oil bought or bullied independent firms. Ida's neighbors and even her own father were in Rockefeller's sights.

In adulthood, Ida joined a new movement in journalism. She was a "muckraker" - looking to dig up dirt on the greedy and unscrupulous monopolies of the Gilded Age. She wrote a 19-part investigation of Standard Oil that became a nationwide hit and forced the US government to act and break Rockefeller's empire apart.

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Benjamin Franklin had a full life - he was a scientist, statesman, and a Founding Father. But we're looking at the huge impact he had as a writer of best-selling business books. Franklin first picked up the pen as a poor, downtrodden teenager to write satire, but as he became richer and more successful he instead shared his entrepreneurial insights with the public.

His sayings about time-wasting, thrift and the rewards of hard work were revolutionary. And both his admirers and critics claim his writings caused a profound global shift in how we think about work and wealth.

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Two-hundred-and-fifty years ago George Washington was fighting the Revolutionary War against the British, but Robert Morris doing something just as vital. He was raising money for the fighting and buying the gunpowder, tents, food and uniforms Washington's army needed.

Morris had been a merchant before the revolution, so didn't see why he shouldn't personally profit from his work supplying the colonists' struggle. He emerged from the war as a rich man and owned huge tracts of land. But the turbulent final years of the 18th Century saw Morris go first into substantial debt and then fall into utter ruin.

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