He is best known for his frescoes, which decorate many of the churches and monasteries along the Upper Swabian Baroque Route.

[1] Spiegler was born the Free Imperial City of Wangen im Allgäu, the son of a district court attorney.

After the death of his father in 1692, his mother married the painter Adam Joseph Dollmann, a member of an old patrician family in Wangen.

During the course of his studies, Spiegler also became acquainted with the historical painting in vogue with the Dutch painters of the time.

From 1723 to 1725 Spiegler painted frescoes in the Ottobeuren Abbey that show the strong influence of the Italian painter Jacopo Amigoni (1682–1752).