Xi jiaotong university. Liu Yuhang graduated from the University of Pennsylvania from 20 14 to 20 19 with a doctorate in mathematics. On April 8, 2023, Liu Yuhang went to Xi 'an Jiaotong-Liverpool University as an assistant professor in the Department of Mathematics. Xi Jiaotong University, located in Suzhou City, Jiangsu Province, is a Chinese-foreign cooperatively-run university with independent legal personality, which was approved by the People's Government of China and the Ministry of Education.