Li Dazhao
Cai returned to China in 1916 and served as the President of Peking University the following year. There he resumed his support, begun in his Paris years with Li Shizeng, for the Diligent Work-Frugal Study Movement, which sent worker-students to France. It was during his tenure at Peking University that he recruited such famous thinkers (and future Chinese Communist Party leaders) to the school as Chen Duxiu and Li Dazhao, as well as quite different thinkers as Hu Shih, a close friend, Liang Shuming and the painter Xu Beihong.