The pen name Hongshan is the name of which painter?

Dou Hongshan, whose ancestral home is Liquan, Shaanxi, is also known as Xiaodou and his nickname is Hongshantang. He originally worked for the Central Security Bureau, and graduated from the painting department training class of Xu Beihong Art Institute of Renmin University of China, the postgraduate class of the Calligraphy Research Institute of Capital Normal University, and the art theory and research and creation advanced training class of the Academy of Fine Arts of Tsinghua University.