From 1915 to 1918 he served in the Austro-Hungarian Army and was deployed to the front in the South of the County of Tyrol.
After the First World War, in 1919 he gained a doctorate in Vienna and then worked in the Austrian banking system.
From March 1941 he was involved in the expropriation of Jewish property and sending forced laborers to Germany to work in the arms industry.
After the German capitulation Fischböck managed with help from the organization ODESSA to escape to Argentina.
[1] In Austria, a prosecution was brought against him but a conviction was not secured and in 1957 his acts fell under an amnesty.