The article is about the work of Joseph Hatzinger, son of builder Paul (Pál) Hatzinger from Székesfehérvár (Hungary), and Joseph’s sons Heinrich and Paul. Joseph worked in Osijek and in Slavonia in the second half of the eighteenth century. In the early nineteenth century, his older son Heinrich spent almost a decade as a professor at the Genie-Akademie (Military Academy of Engineering) in Vienna and designed two important Early Neoclassical churches at Terezin and Josefov fortresses in Bohemia. His younger son Paul, after a brief period as a lecturer at the Genie-Akademie, worked as an engineer in various parts of the Habsburg Monarchy during the first half of the nineteenth century, from Galicia, across Dalmatia, to Vienna and Lower Austria in the final phase of his career. Finally, his great-great-grandson Gusztáv Kasper, the grandson of Paul Hatzinger Jr, became a Hungarian railway engineer at the turn of the twentieth century.