My name is Robert Peerlings and I have been active as an orthodontist in private practice since 1991. In 1992 I finished a PhD research at the Radboud University Nijmegen concerning the effect of orthodontic treatment on dento-facial esthetics. I have been engaged in administrative, educational and scientific activities in my profession. Since 2003 I developed an interest in cartography and collecting maps with a special interest in Ptolemy. The first co-author is Frans Laurentius. He has been active as an arthistorian and artdealer since 1998. His main interests are prints and drawings. He has been engaged in paper- and watermark research for over 25 years. In 2010 he finished a PHD research at the University of Utrecht concerning the print publisher Clement de Jonghe. Next to these activities he has been active in archeological projects and research into the material culture in the Netherlands between 1550 and 1850. The second co-author is Jaap van den Bovenkamp. He has been active as a map dealer since 2000. His main interest are maps and books from and about the Netherlands and the Dutch Republic. During the years he developed a special interest in rare and early maps like the so called Lafreri maps and Ptolemy maps.
The 1478, 1490, 1507 and 1508 Rome editions of Ptolemy's Cosmography including the Ruysch world map and their watermarks