Willem Bernard Drees holds the chair in philosophy of religion and ethics, in the Leiden Institute of Religious Studies, Leiden University, since 2001. Drees is also editor of Zygon: Journal of Religion and Science.

Drees has been the editor or co-editor of twenty books, published more than fifty journal articles and essays, numerous book reviews and articles for the wider public. He has lectured widely in Europe and the United States. His eight books include Beyond the Big Bang: Quantum Cosmologies and God (1990), Religion, Science and Naturalism (1996), and Creation: From Nothing until Now (2002). As of Sept 1, 2009, he is Professor of Philosophy of Religion and Ethics and vice-dean of the Faculty of Humanities of Leiden University in the Netherlands.

Drees has three doctorate degrees. He was trained in theoretical physics (Utrecht, 1971–1977) and theology/philosophy of religion (Amsterdam & Groningen), with doctorates in theology (Groningen 1989) and philosophy (Amsterdam, 1994). From 1995 until 2001 he held the Nicolette Bruining Chair for Philosophy of Nature and of Technology from a Liberal Protestant Perspective at University of Twente (Netherlands). In 2001 he served as Executive Director of the All European Academies (ALLEA) - an organization that has for members most of the science and arts academies in Europe.