Austrian architect, whose family came from the Vorarlberg, the westernmost part of Austria. He is best known for his Rococo architecture, mainly in Southern Germany and Switzerland. He was the son of an architect and studied with Franz Beer. He worked mainly in Swabia, Baden, Alsace and Switzerland. One of his best known works is the pilgrimage church at Birnau on Lake Constance, whose appearance does not reveals its rich interior. Another outstanding work is the monastery library at the Abbey of Saint Gall, Saint Gallen, Switzerland. //