Leopold Poetsch was born on 18th November 1853. He began his history teaching career in Maribor and later moved to Linz. He held strong nationalist opinions on the subject and believed that all ethnic Germans should be united by a single government. He also held strong racist views and told his pupils that Jews and Slavs were members of "inferior races".

In 1901 Adolf Hitler joined Poetsch's history class. William L. Shirer, the author of The Rise and Fall of the Third Reich (1964), has commented: "There was one teacher at the Linz High School who exercised a strong and, as it turned out, a fateful influence on the young Adolf Hitler. This was a history teacher, Dr Leopold Poetsch, who came from the southern German-language border region where it meets that of the South Slavs and whose experience with the racial struggle there had made him a fanatical German nationalist."

Hitler wrote in Mein Kampf (1925): "Dr. Leopold Potsch, my professor at the Realschule in Linz, embodied this requirement to an ideal degree. This old gentleman's manner was as kind as it was determined, his dazzling eloquence not only held us spellbound but actually carried us away. Even today I think back with gentle emotion on this gray-haired man who, by the fire of his narratives, sometimes made us forget the present; who, as if by enchantment, carried us into past times and, out of the millennial veils of mist, molded dry historical memories into living reality. On such occasions we sat there, often aflame with enthusiasm, and sometimes even moved to tears. What made our good fortune all the greater was that this teacher knew how to illuminate the past by examples from the present, and how from the past to draw inferences for the present. As a result he had more understanding than anyone else for all the daily problems which then held us breathless. He used our budding nationalistic fanaticism as a means of educating us, frequently appealing to our sense of national honor. By this alone he was able to discipline us little ruffians more easily than would have been possible by any other means. This teacher made history my favorite subject. And indeed, though he had no such intention, it was then that I became a little revolutionary. For who could have studied German history under such a teacher without becoming an enemy of the state which, through its ruling house, exerted so disastrous an influence on the destinies of the nation? And who could retain his loyalty to a dynasty which in past and present betrayed the needs of the German people again and again for shameless private advantage?"

Leopold Poetsch died on 16th October 1942.