He spent two periods at the University of Kraków (1518 to 1520 and 1525 to 1527), where he lectured on classical authors; and as a schoolmaster (in 1520 at Levoča, a position he obtained with the help of Johann Henckel, and in 1521 at Košice, both now in Slovakia).
[4][5] John Leland wrote a Latin poem praising Cox, including references suggesting he had been at Paris and Prague.
In 1527 Cox had the opportunity to participate in a high-profile exchange of open letters, from Martin Luther to Henry VIII of England.
Szydłowiecki and Jan Łaski gave Cox his introduction to Erasmus;[3] he several times lectured on the De copia.
[8] Cox had dedicated a 1518 book (an oration praising the university) to Justus Ludovicus Decius (Jost Ludwig Dietz) from Alsace, who had been in Kraków from 1505.
[1] He translated from Greek into Latin Marcus Eremita de Lege et Spiritu, and from Latin into English Erasmus's Paraphrase of the Epistle to Titus, which in 1534 he asked the printer Robert Toy to convey to Thomas Cromwell, at a time when Cox hoped for Cromwell's influence to secure a move the free school at Bristol;[3][17] it appeared again in 1549, with a dedication to John Hales, clerk of the hanaper.
Lily's Construction of the eight parts of Speech, 1540 was a version of William Lilye's basic Latin grammar, again dedicated to Cromwell.