No woman in the Gilded Age made as much money as Hetty Green, America's first female tycoon. A strong woman who forged her own path, she was worth at least $100 million by the end of her life in 1916--equal to about $2.5 billion today. Green was mocked for her simple Quaker ways and her unfashionable frugality in an era of opulence and excess; the press even nicknamed her "The Witch of Wall Street...