Main (Thompson) Library location: South wing -- Fifth window. Johannes Prüss, (c.1490 – 1555) son of Johannes Prüss the Elder, was born in approximately 1490 and quickly learned the trade of printing. Following his father's death in 1511, he and his brother-in-law Renatus Beck assumed operation of the family practice; both printers worked in close proximity, however, they published independently. Until 1546, Prüss printed primarily theological texts from the press at Tiergarten, including the works of Guillaume DeMolin, John Calvin, and Martin Luther. The mark of Johannes Prüss in the Vassar Library displays the printer's stylized monogram. Instead of using both initials, however, Prüss chose P.S. for his decorative symbol; the S possibly signifies his work in Strasbourg. Crosslets form at the tips of the extensions from the upper and lower lines of the P.