His appointment as rector of a school at Buda was of no long continuance: his views excited the zeal of the Dominicans, and he was thrown into prison.
He returned to Basel charged with the task of collecting the opinions of continental reformers on the subject of Henry VIII's divorce, and was present at the death of Oecolampadius (24 November 1531).
He now, while holding the chair of Greek, was appointed extraordinary professor of theology, and gave exegetical lectures on the New Testament.
In 1534, Duke Ulrich called him to Württemberg in aid of the Reformation there, as well as for the reconstitution of the University of Tübingen, which he carried out in concert with Ambrosius Blarer of Constance.
A brilliant scholar, a mediating theologian, and personally of lovable temperament, his influence was great and wisely exercised.