Ngozi Okonjo-Iweala

"When I became finance minister, they called me Okonjo-Wahala - or 'Trouble Woman.' It means 'I give you hell.' But I don't care what names they call me. I'm a fighter; I'm very focused on what I'm doing, and relentless in what I want to achieve, almost to a fault. If you get in my way, you get kicked."