 He was equally well-known, as an exponent of the philosophy of Bertrand Russell, whom he accompanied on a tour of China in 1920.A prominent exponent of Chinese liberalism, he became a powerful influence in the China National Socialist Party in its original incarnation as a non-Communist "third force" grouping opposed to the dictatorship of the Guomindang (Kuomintang or KMT) under Chiang Kai-shek.In addition to the Second World War era, Zhang, Dongsun was a professor of Philosophy and Sinology at Tsinghua University in the 1930s and the 1940s.