He preached and taught variously at Siena, Viterbo, and Perugia before eventually moving to Florence, in which area he was a widely respected preacher, eventually being appointed by the provincial chapter at Rieti as a lector in the church of Santa Maria Novella in 1305.

[1] Jordan was renowned for his knowledge, especially of the breviary, missal, the Bible, and its marginal notes, and the second half of the Summa Theologiae, all of which he had memorised, according to the chronicle of the Dominican convent of Pisa.

[2] At Florence he would reportedly preach five times a day, walking about, both indoors and out, followed by a crowd of listeners as he developed his topic.

[2] During his lengthy sermons his friend and disciple, Silvester of Valdiseve, sometimes sat near the pulpit with wine to refresh him.

His preaching was said to have a positive effect on Florentine public life and morality by its emphasis on sound Thomistic doctrine, Christian living, and perseverance.