He was the chief architect of the emperor Ferdinand I in his Inner Austrian domains, and was responsible for setting up the Italian-style modern fortification system in Croatia, along the border with the Ottoman Empire. He planned the town of Klagenfurt, which had previously been a small settlement donated to the Carinthian estates by emperor Maximilian for their residence. He led the reconstruction of many castles that had been destroyed and frequently only partially rebuilt in the disastrous 1511 earthquake. His work is attested in several Sytrian towns, such as Radkersburg, Maribor and Ptuj.