Percy S.F. van Keulen, Ph.D. (1995), Leiden University, is research fellow at the Peshitta Institute Leiden and author of Manasseh through the Eyes of the Deuteronomists (Leiden 1996) and Two Versions of the Solomon Narrative (Leiden 2004).
Willem Th. van Peursen, Ph.D. (1999), Leiden Unversity, is research fellow at the Peshitta Institute Leiden and author of The Verbal System in the Hebrew text of Ben Sira (Leiden 2003) and Language and Interpretation in the Syriac Text of Ben Sira (Leiden 2007).