Fauth was the last of the great German students of the Moon. He was a careful observer, an excellent draftsman, and a vociferous critic of other observers, especially non-Germans.
He was born into a family of potters in Bad Durkheim, Die Pfalz, Germany but became a school teacher. His advocation was astronomy and by 1898 he had published a book of observations of Mars and Jupiter. This was followed in 1906 by What We Know About the Moon (translated into English in 1909 as The Moon in Modern Astronomy). Fauth became a disciple of the crank Horbiger and in 1912 published a huge book defending Horbiger's theory - this effectively destroyed Fauth's reputation as a serious scientist, but the quality of his Moon observations was always appreciated. His greatest lunar work was Unser Mond (Our Moon) published in 1936, but judging by the lack of references to it, it appears not to have influenced any later observers. Fauth reportedly published two lunar atlases (1895 and 1932) and his large 137 inch diameter map was finally published in 19xx. He provided advice for the films Mondlicht (At Moon's Light; 1932) and Du und der Sterne (You and the Stars; 1933).
Information summarized from "Phillip Fauth's Great Map", by Herman Fauth in Journal of International Lunar Society, p. 65-67 (volume and year not recorded!).