Zhang Ruimin (L), Chairman of the Board of Directors and CEO of Haier Group, and Adi Ignatius, editor-in-chief of Harvard Business Review, are engaged in a conversation at the Thinkers50 2019 Awards Gala in London, Britain, Nov. 18, 2019. Thinkers50, the well-known ranking of global business thinkers, announced its 2019 ranking of management thinkers here on Monday night. (Xinhua/Han Yan)