David T. Runia, D.Litt. (1983) Free University, Amsterdam, is Professor of Ancient and Medieval Philosophy at the University of Leiden and C.J. de Vogel Extraordinary Professor of Ancient Philosophy University of Utrecht. He has published extensively on Philo, including Philo of Alexandria and the Timaeus of Plato and Philo of Alexandria: an Annotated Bibliography. He has been editor of The Studia Philonica Annual since 1989.