Is Zheng Yisu's calligraphy collectible?

Zheng Yisu's calligraphy is very collectible. Zheng Yisu is a famous mad grass writer, and his calligraphy is valuable for collection. Zheng Yisu, whose real name is Zong Lie and whose pen name is Zhong Yan, was born in Shantou, Guangdong. Crazy cursive writer, painter and seal engraver. He is currently the president of Lingnan China Painting Academy, the president of Baiyunshan Painting and Calligraphy Research Association and the curator of Yisu Crazy Grass Art Museum. Standing Committee member of China Juvenile Delinquency Research Association, Deputy Secretary General of China Juvenile Delinquency Professional Committee, Professor of Guangdong Folk Art Institute, Permanent Consultant of Hong Kong Painting and Calligraphy Institute, Visiting Professor of Singapore Painting and Calligraphy Institute, Director and Editor-in-Chief of China Delta Culture and Art Research Center. /kloc-studied calligraphy at the age of 0/3,/kloc-studied calligraphy with Mr. Li Zhenhai at the age of 0/8.