The following very interesting document can be found at http://www.rheinische-geschichte.lvr.de/persoenlichkeiten/Q/Seiten/FamilieQuentel.aspx (translated):

Johann Quentel, Peter’s younger son, matriculated at the University of Cologne in 1536 while still a minor, along with his brother Peter. In 1546, he succeeded his father in the publishing house, and in 1547, he married Sophia Birckmann (1529–1589) from the Cologne publishing family of the same name. Johann’s publishing program continued the work of his father in his later years. Theological literature dominated, including a large number of writings by Georg Witzel (1501–1573), with the Mainz printing house of Franz Behem being a particularly important publisher. This firm had been financially supported by Witzel himself, who also frequently stayed in Mainz, which facilitated proofreading. Overall, the blackletter typefaces, introduced by Peter Quentel in his later years, gained considerable ground in display printing. Johann Quentel died in 1551, barely 30 years old. After the sudden death of Johann Quentel, his young widow Sophia married Gerwin Calenius (1525-1600), a licentiate in law, a few years later (1557). The marriage produced two sons and three daughters. Calenius came from Lippstadt, had earned his licentiate in law from the University of Cologne in 1545, and quickly established himself in the city. On July 1, 1579, he was officially registered as a citizen, having already been a resident since around 1560.

He was a member of the Gaffel Windeck guild. Calenius was a wealthy man, as evidenced by the inventory of his landholdings. His considerable fortune and the high reputation he enjoyed in Cologne provided excellent conditions for a seat on the Cologne City Council, which he held from 1579 until his death. Of his numerous public offices, that of Voting Master was the most important, as it required him to oversee book production with regard to censorship regulations. From 1558 – when he took over management – ​​the publishing house operated as “Heirs of Johann Quentel and Gerwin Calenius,” and from 1567 as “Gerwin Calenius and Heirs of Johann Quentel,” reflecting the principal’s newfound influence. Gerwin Calenius skillfully maintained the company at the level to which Peter Quentel had brought it. He became one of the most important and financially powerful Cologne publishers of the second half of the 16th century. As his wife’s financial manager, he also controlled her shares in the Birckmann company. This resulted, for a time, in a considerable concentration of capital and influence in his hands.

After the death of Arnold Birckmann the Younger (1523-1574) and his wife Barbara, their children were placed in the care of their guardian, Calenius, who was thus able to influence the business of the Birckmann company. Large numbers of printers were employed, particularly Gottfried von Kempen (who died after 1598) in Cologne, but also Behem in Mainz, while the company’s own Quentel printing press was not as well-equipped. Several interesting sources provide information about the Cologne firm during this period, such as a publisher’s poster from 1573 and—a rarity in Cologne—an account book kept by Gerwin’s stepson, Arnold Quentel (who died in 1621), between 1577 and 1586. This indicates that the printed texts were predominantly theological in nature. The list of works by Georg Witzel, in both German and Latin, was particularly extensive. The spectrum ranged from texts by the Church Fathers to devotional religious writings for the general public. Among the German texts, those by Julius Pflug (1499-1564), Jakob Feucht (1550-1580), and Dietenberger stood out. Furthermore, there were connections to the Jesuits. Peter Canisius (1521-1587) obtained an imperial privilege for the publishing house in 1560 and a papal one in 1569. Among the Cologne authors, Caspar Ulenberg (1549-1617) should also be mentioned, several of whose works were published by Calenius. 

The major historical work by Laurentius Surius (1523-1578) and its continuations by Michael von Isselt (died 1597), which had been translated into German by Heinrich Fabritius (1575-1596), a close friend of Calenius, were published by Quentel. Furthermore, several translations of Justinian’s *Institutes* by Justinus Gobler (1505-1567) are documented in the field of jurisprudence. Foreign literature apparently played a minor role (Didacus de Estella (1524-1578), Luis of Granada (1504-1588)). Typical of the German output of the publishing house was a relatively small circle of authors with few works, some in numerous editions. Calenius evidently placed his trust in a few bestsellers, which allowed for fairly reliable calculations. Besides his work as a publisher and printer, he proved to be a successful bookseller, also offering prints from other printing houses, especially from Antwerp, Paris, and Lyon. He maintained close business relationships, particularly with Christoph Plantin (1520-1589) and Martin Nutius (died 1608) in Antwerp and Michel Sonnius (died c. 1588) in Paris, as well as with Georg Willer (1564-1591) in Augsburg. His successor as publisher in 1595 was his stepson Arnold Quentel, whom Calenius had already entrusted with managing the printing house in 1570. was.

 Children (2 sons, 3 daughters):

1. Gerwin; * …; + 1620 Cologne; {–> eod.}
ooI … NN.
ooII … NN.

Children 1. marriage:
1. Gertraud; * …; + …; oo … Johann OECKHOVEN, Councillor and Mayor of Cologne; + before …
2. Sophia; * …; + …

Children 2. marriage:
3.  Anna; * …; + …; oo Franziskus Fabri; Lic. jur.; Electoral Cologne Court Councillor