Janet Yellen

Janet Yellen is President Obama's choice to replace Ben Bernanke as Chairman of the United States Federal Reserve when his term ends later this month, making her the most powerful central banker in the world and, arguably, the most powerful woman in the world. But who is she? Mary Ann Sieghart finds out - discovering, among other things, how Janet Yellen reacted when an earthquake shook her office.Producer: David Edmonds.