Forbes Magazine’s 48th most powerful woman in the world (No. 44 in 2014) Ngozi Okonjo-Iweala, the former Minister of Finance for Nigeria, has helped the country’s economy, the largest in Africa, grow an average of 6% (per annum) over three years. She is credited with developing reform programs that helped improve governmental transparency and stabilizing the economy. Okonjo-Iweala was the first woman to be the finance minister and the foreign minister of the West African country with a GDP of $502 billion. The Harvard- and M.I.T.-trained Okonjo-Iweala spent 21 years as a development economist at the World Bank.