PCO is a project of the American Numismatic Society co-directed by Dr. Peter van Alfen and Ethan Gruber. The web database, based on the Numishare platform, has been developed by Ethan Gruber, who also oversaw the creation of the necessary Nomisma concepts for the project.
Substantial work in developing PCO has been carried out by Gunnar Dumke of the Institut für Klassische Altertumswissenschaften at Martin-Luther-Universität Halle-Wittenberg. Disnarda Pinilla has provided considerable assistance in organizing material within the ANS collection. Alan Roche and Emma Pratte are responsible for the photographs of ANS coins. Prof. Bernhard Weisser and Dr. Karsten Dahmen have catalogued the material at the Münzkabinett of the Staatliche Museen zu Berlin. At the Bibliothèque Nationale de France (BnF) Caroline Carrier and Julien Olivier have catalogued the Ptolemaic coins in the collection there. The PCO banner image was created by ANS photographer, Alan Roche.