Johann Georg Platzer (1704 - 1761). Johann Georg Platzer was a prolific Austrian Rococo painter and draughtsman. Platzer was born in Eppan in the County of Tyrol, and came from a family of painters. He painted primarily historical and mythical scenes. The Joanneum Alte Galerie in Graz houses the largest collection of Platzer's work under a single roof. Platzer worked with his uncle as a court painter in Passau. He returned to Eppan where he continued to work until his death in 1761.