We know the negative images of Africa -- famine and disease, conflict and corruption. But, says Ngozi Okonjo-Iweala, there's another, less-told story happening in many African nations: one of reform, economic growth and business opportunity. Ngozi Okonjo-Iweala, a director of the World Bank, was Nigeria's Finance Minister and then briefly Foreign Affairs Minister from 2003 to 2006, the first woman to hold either position. During her tenure as Finance Minister, she worked to combat corruption, make Nigeria's finances more transparent, and institute reforms to make the nation's economy more hospitable to foreign investment. The government unlinked its budget from the price of oil, its main export, to lessen perennial cashflow crises, and got oil companies to publish how much they pay the government. Since 2003 -- when watchdog group Transparency International rated Nigeria "the most corrupt place on Earth" -- the nation has made headway recovering stolen assets and jailing hundreds of people engaged in international Internet 419 scams. Okonjo-Iweala is a former World Bank vice president who graduated from Harvard and earned a Ph.D. in regional economics and development at MIT. Her son Uzodinma Iweala is the celebrated young author of Beasts of No Nation.