Career
Neppach worked from 1919 in the German film industry. He oversaw the art direction of over eighty films during his career, including F.W. Murnau"s Desire (1921) and Richard Oswald"s Lucrezia Borgia (1922). Neppach was comparatively unusual among set designers during the era in having university training.
In 1932 he switched to concentrate on film production.
In May 1933, his first Jewish wife Nelly, a successful tennis player, took her life because of the discrimination and prosecution of Jews in Nazi Germany.