Zentralinspektor Friedrich Otto Haller-Heimann (geb. Holzgruber)

Friedrich Holzgruber was born out of wedlock to Therese Holzgruber and Julius Haller-Heimann, who had converted from Judaism to the Protestant faith. His father legitimized his son, whereupon he took the surname 'Haller-Heimann'. Nothing has been preserved about his childhood and youth.

Friedrich Haller-Heimann moved to Vienna and began working for the Imperial-Royal State Railway at Vienna's Nordbahnhof in 1911. State Railway in 1911. He was drafted into the First World War and witnessed the defeat of Austria-Hungary in 1918, the collapse of the Dual Monarchy and the expulsion of the House of Habsburg. He married Maria Wimmer and became the father of a daughter in 1918 and a son in 1920.

Friedrich Haller-Heimann was a convinced legitimist and led a legitimist group in his home town of Perchtoldsdorf near Vienna as well as one in what was now the Austrian Federal Railways at Nordbahnhof. In this role, he distributes advertising for the return of Otto von Habsburg-Lothringen to the Austrian throne. As a legitimist, he was a staunch opponent of National Socialism.

On March 12, 1938, Friedrich Haller-Heimann witnessed the downfall of free and independent Austria with the invasion of the German Wehrmacht. With the occupation of Austria, German legislation was adopted and with it the 'Nuremberg Race Laws', according to which he was classified as a 'Mischling I.

His daughter Else's promise to start work at the Postsparkasse was withdrawn. His son Ernst was arrested on November 1, 1940 and mistreated to such an extent that he was released from prison in March 1942 for health reasons. He subsequently died of heart failure in Baden near Vienna in August 1943. From the end of 1942, Friedrich Haller-Heimann found work again as an office worker.

In Vienna, Friedrich Haller-Heimann witnessed the liberation of Austria and the re-establishment of the Republic in April and May 1945. He joins the newly founded Austrian People's Party (ÖVP) and is one of the co-founders of the ÖVP-Kameradschaft der politisch Verfolgten und Bekenner für Österreich, where he held the position of Deputy Chairman of the Vienna regional organization until his death.