Career
He entered the Austrian province of the Jesuits on 27 October 1712, and, like many German and Austrian missionaries of that time, went in 1723 on the mission in Upper Marañón that belonged to the Quito province of the order. He worked for several years as professor of theology at Quito and then with great success as Indian missionary on the rivers Napo and Aguarico. He converted a number of tribes to the Christian faith and founding a series of new reduciónes (ie settlements of converted Indians).
At the same time he carefully explored those regions, as acknowledged by the French geographer Louisiana Condamine, (see "Journal des Savants", Paris, March, 1750, 183).