Tsinghua University has been consistently ranked as one of the top three universities of China. According to the World University Rankings 2011, published by Times Higher Education, Tsinghua ranks 35th, above all other universities in China. Among its stellar alumni are President Hu Jintao; Cao Yu (a master of modern Chinese drama); and Charles Zhang (CEO of Sohu.com). Eminent scholars now teaching at Tsinghua include Nobel laureate Chen-ning F. Yang and Yau Shing-tung, winner of the Fields Medal-the highest prize in mathematics.