John D. Rockefeller has been described in many different ways: as greedy and cutthroat, as munificent and caring, as "solitary, taciturn, remote, and ascetic," in the words of author Daniel Yergin. But as a manager, perhaps Rockefeller's most indispensable quality was this: He was uncompromisingly forward-looking.
It was Rockefeller, more than any single figure, who helped revolutionize the way people in the 19th century illuminated their homes, hastening the shift from costly whale oil to kerosene -- a fuel that was, as he put it, "cheap and good."