Studied under Ma Rong, then taught
Eastern HanThe Book of the Later Han says Zheng Xuan went west through the pass and, by way of Lu Zhi, studied under Ma Rong of Fufeng, who had over four hundred pupils. For three years he could not see Ma Rong, who had senior pupils teach him. Later the students following him numbered in the hundreds or thousands, and pupils such as Zhao Shang of Henei came from far away, thousands in all.