Lloyd P. Gerson is Professor of Philosophy at the University of Toronto. He is the author of From Plato to Platonism (2013), and the editor of The Cambridge History of Philosophy in Late Antiquity (Cambridge 2010) and Plotinus: The Enneads (Cambridge 2018). James Wilberding is Professor of Ancient and Contemporary Philosophy at Humboldt University, Berlin. He is the author of Plotinus' Cosmology: A Study of Ennead 2.1 (2006) and Forms, Souls and Embryos: Neoplatonists on Human Reproduction (2017), and the editor of World Soul: A History of the Concept (2021).