He continued to study medicine, following the lectures of Theodor Zwinger, Thomas Erastus, Felix Plater, and Johann Nicolaus Stupanus.
After that he practiced medicine for a few years, until he succeeded Christian Wursteisen as Professor of Mathematics at the University of Basel in 1586, a position he held until his death in 1629.
[4][5] After Fridolin died the chronicles were bequeathed to his daughter Magdalena, who passed them on to Petrus Ryff.
The Basler Chroniken were edited and re-published in 1872 by the Historische und Antiquarische Gesellschaft zu Basel.
They provide an invaluable source of information about the history of Basel, and that part of Europe in the 16th century.