Whose calligraphy and painting appraisal collection belongs to Tongwei County, Dingxi City, Gansu Province?

Yao Weifeng. According to relevant public information, calligrapher Yao Weifeng's work "Autumn in a Mountain Residence" was collected by the Appraisal and Evaluation Center. Yao Weifeng, male, from Tongwei County, Dingxi City, Gansu Province, aged 53, is a calligraphy enthusiast. He is now a member of Mo Yun Painting and Calligraphy Institute, the capital of Beijing, and a special calligrapher of Century 100 International Cultural Development Center.