My father used to receive calligraphy lessons from Mr. Xie when he retired from work. 

謝宗安－無名氏山水畫五律－國美典藏

FYI, my father also asked Mr. Xie to write me a piece of calligraphy under the same landscape poem in the same ponts. Now I am hanging it in my parlor room. Thank you, Mr. Xie.