In 1903, he met best-selling author Karl May, and subsequently became the cover illustrator of a number of May's books including Winnetou, Old Surehand, Am Rio de la Plata.

[1] Jahn began blackmailing Schneider by threatening to expose his homosexuality, which was punishable under § 175 of the penal code.

In Italy, Schneider met painter Robert Spies [de], with whom he traveled through the Caucasus Mountains.

He then traveled back to Germany, where he lived for six months in Leipzig before returning to Italy, where he resided in Florence.

When the First World War started, Schneider returned to Germany again, taking up residence in Hellerau (near Dresden).