Women make up fewer than ten per cent of national leaders worldwide, and behind this eye-opening statistic lies a pattern of unequal access to power. Through conversations with some of the world's most powerful and interesting women - including Jacinda Ardern, Hillary Rodham Clinton, Christine Lagarde, Michelle Bachelet, and Theresa May - Women and Leadership explores gender bias and asks why there aren't more women in leadership roles. Ngozi Okonjo-Iweala is the new director-General of the World Trade Organization.