Arthur Westwell is a research assistant in the Faculty for Catholic Theology at the Universität Regensburg. His individual research project, in which he investigates Carolingian liturgical manuscripts, is supported by the Deutsche Forschungsgemeinschaft. He has held fellowships at the Pontifical Institute for Medieaeval Studies in Toronto, funded by the Mellon Foundation, and at the Universität Trier, with the Humboldt Stiftung.