Walter Liebenthal - Chinese Source
https://read01.com/zh-cn/K457R5.html#.YDJpWKsYA2w
According to this, it says that:
'1937年记载“德国柏林大学哲学博士李华德,拟译《肇论》,
以疑义来访(太虚)大师.'
'In 1937, it was recorded that "Walter Liebenthal (Li Huade - 李华德), a Ph.D originally from the University of Berlin, Germany, intended to translate the "Zhao Lun". However, as he had 'doubts' about its content and meaning, he visited the Great Master Taixu (太虚) to ask for his advice.'
Adrian