That's Zhu Zhishan
Zhu Yunming (1460-1526) was a calligrapher in the Ming Dynasty. His courtesy name was Xizhe, and his name was Haozhishan. Because he had an extra finger on his right hand, it was born from the Haozhi finger. A native of Changzhou (Suzhou), Jiangsu Province, he was born into a family of Kui Ru who had been an official for seven generations. Together with Tang Bohu, Wen Zhengming, and Xu Zhenqing, he is known as the "Four Talents of the South of the Yangtze River" (also known as the Four Talents of the Wu Clan).