Watch HDToday. They are four of the most successful businesswomen in China: Belonging to a generation who experienced the austerity of China's cultural revolution, followed by the subsequent economic boom, they have worked their way to the very top in a patriarchal society. Today, Yang Lan is the owner of one of the leading private media companies. Dong Mingzhu is a tenacious female CEO, heading up the world's largest manufacturer of air conditioning systems. Zhang Lan is a tycoon in the luxury restaurant business. Zhou Yi is a top manager working for a big american IT company. How were these careers built? What are the social and economic contexts in which they operate? And what do these women think about the political, social and cultural state of their country?