Josef Greiner (28 June 1886 in Preding, Styria — 4 September 1971 in Vienna) was an Austrian writer.
He moved to Vienna around 1908 and earned his living through various jobs, including as a sign painter, and as a lamplighter for a cabaret.
Greiner sent a copy of this book to Joseph Stalin, offering his services to facilitate Soviet-German economic relations.
He tells several stories about Hitler's anti-Semitic behavior at this time, including a story that he tormented one Polish Jew with stink bugs and by giving children "Aryan chocolate" to induce them to torment their Jewish playmate as a "filthy Jew".
[1] The English-language version of Shigeru Mizuki's Hitler stated in its notes section that "[Greiner's] books have been dismissed as easily disproved lies and self-aggrandizement.