At the University of Franeker, he was appointed professor extraordinarius in 1598, and served from 1600 to 1635 as professor ordinarius of mathematics, navigation, surveying, military engineering, and astronomy.
På Universitetet i Franeker, blev han udnævnt til professor extraordinarius i 1598, og tjente 1600-1635 som professor ordinarius i matematik, navigation, landmåling, ingeniørtropper, og astronomi.