Born in Posen (Poznan, now in Poland), he settled in Jevicko, from which he got his name Gewitsch. He then moved to Vienna and from about 1724 achieved a reputation through his illustrations for a series of Hebrew illuminated manuscripts. About a dozen of his illuminated haggadot have survived and he also executed other commissions including an illustrated Plaster for an Austrian archduke. In 1735 he was employed by the Imperial Library in Vienna.