He studied at the Latin school in Sélestat with Martin Bucer and in 1499 he matriculated at the University of Basel, where he met Huldrych Zwingli.
[3] That summer he translated Zwingli's petition to the bishop of Constance (Konstanz) for the legitimization of clerical marriage from Latin into German.
[4] That summer he began preaching against clerical marriage prohibitions, which resulted in a group of the nuns at petitioning to be released from their vows.
[6] In September of that year, Jud preached a sermon in Saint Peter's against religious images, and the result was several acts of iconoclasm in Zürich.
On 11 April 1525, Jud appeared before the Zürich magistrates with Zwingli, Kaspar Megander, Oswald Myconius and others, petitioning for abolition of the mass.
[2] On 19 June 1525, the Carolinum Reformed institution of theological training, also known as the Prophezei, opened in the Grossmünster in Zürich, where Jud was a prominent figure.
[citation needed] The late 1520s was a flurry of activity for Jud and the Swiss Reformers as they were dealing with Anabaptism, the resurgence of Catholicism in other territories, and the Eucharistic controversies with the Lutherans.
Martin Luther published against the Swiss Eucharistic theology in 1526 with his book The Sacrament of the Body and Blood of Christ - Against the Fanatics.
[12] Jud's friends begged him to dress in women's clothing and hide, but instead he continued to boldly preach in Zürich, referring to Kappel as God's judgment, not for abandoning the Catholic faith, but for not carrying reform far enough.
Not long after though, forces from Schwyz set up outside Zürich, leading men such as Jud and Oswald Myconius to prepare for the worst.
[citation needed] In addition to this period of depression, some of Jud's theological and ecclesiastical views changed drastically, albeit temporarily, after falling under the influence of Caspar Schwenckfeld, a German spiritualist, and to a lesser extent Johannes Oecolampadius.
[18] In December 1535, Jud met with Konrad Pellikan, Theodor Bibliander (from Zürich) and Oswald Myconius and Simon Grynaeus (from Basle) to try and harmonize their theology.
Other figures included Martin Bucer, Wolfgang Capito, Heinrich Bullinger, Simon Grynaeus, and Oswald Myconius.
[21] It is also assumed that Jud played a role in converting the printer Christoph Froschauer, who was critical in distributing Zwingli's works in Germany.
[22] Jud exemplified the heavy interiority of spiritualism that was so present in Zwingli's theology, which was a hallmark of the majority of the Swiss movements.