Chairman of the Board of the Compendia Foundation, publisher of CRINT (Brill, Leiden).
Member of the Editorial Board of Jewish and Christian Perspectives Series (Brill, Leiden).
Chairman Sha’ar, Interreligious Theological Comitee of Ojec (Overlegorgaan van Joden en Christenen in Nederland).
Member of the EAJS, European Association of Jewish Studies, SBL, Society of Biblical Literature, EANTS, European Association of Biblical Studies, St. Hiëronymus (Catholic Exegetes), NGJS (Dutch Association of Jewish Studies, Studiosorum Novi Testamenti Conventus, and the Studiorum Novi Testament Societas.
Fellow of Pardes (formerly Folkertsma Stichting) Amsterdam.
Honorary Staff member of the Kineret Regional Project (Israel), Horvath Kur Excavation (under the guidance of prof. J. Zangenberg, Leiden University).
Secretary Nederlandse Genootschap voor Joodse Studieën (NGJS, associated with the EAJS) (until July 2023)
Editor of Kroniek. Informatiebulletin van de Katholieke Raad voor Israël (until 2018)
Member Adviescommissie Kerk en Samenleving (AKS) van de Katholieke Raad Jodendom (until 2018)
