Zhou Jianguo, whose courtesy name was Cambodian Valley, was named Shuangzhixuan. Born in Shanghai in 1956. He studied under the famous seal carver Mr. Jiang Chengzhi. Starting from copying the Qin and Han Dynasties, he then moved on to the Yuan and Zhu styles as well as the Ming and Qing styles. Concentrate on research, integrate into creation, and pursue the state of achieving both form and spirit. He is currently a member of the Xiling Seal Society, a member of the Chinese Calligraphers Association, and a member of the Shanghai Calligraphers Association.