Klaproth was an orientalist or an "Asiatologist," in that he had a good command not only of Chinese, but also Manchu, Mongolian, Sanskrit, Turkish, Arabic, Persian, and even Caucasian languages.
Klaproth's 1812 Dissertation on language and script of the Uighurs (Abhandlung über die Sprache und Schrift der Uiguren) was disputed by Isaak Jakob Schmidt, who is considered the founder of Mongolian Studies.