She was specialized in papyrology and Byzantine philology. He was leading authority in the field of papyrology. She was the founding president of the International Society for Arabic Papyrology. Areas covered also include epigraphy, papyrology, archaeology and numismatics. Exposing modern pseudepigrapha is part of the fields of palaeography and papyrology, amongst others. Sijpesteijn was the founding president of the International Society for Arabic Papyrology (2001-2014). EpiDoc has since been adopted as the native format for the Greek Papyrology site, Papyri.info. In 1948 he was elected Reader in Documentary Papyrology at Oxford. In papyrology and textual criticism this may lead to competing reconstructions and interpretations. He is the Emeritus Professor of Papyrology at the University College London. It is conserved in the Papyrology Rooms at Sackler Library, Oxford, UK. From 1960 to 1989, Parsons was a lecturer in papyrology at the University of Oxford. He specialized in papyrology, first as the assistant of Samson Eitrem.