The phenomenal success of Oprah Winfrey's personal brand holds important lessons for business leaders, writes Eric Markowitz. Winfrey used transparency to build a personal connection with fans, took plenty of risks, tapped regularly into a contact book stuffed with celebrities and, perhaps most important, was willing to quit while she was ahead. "The message is clear enough for entrepreneurs: don't be afraid to end on a high note," Markowitz writes.

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