Kathrin Koslicki is Professor of Theoretical Philosophy at the University of Neuchâtel. Koslicki's research interests in philosophy lie mainly in metaphysics, the philosophy of language and ancient Greek philosophy, particularly Aristotle. In her two books (The Structure of Objects, Oxford UP, 2008; and Form, Matter, Substance, Oxford UP, 2018), she defends a neo-Aristotelian analysis of concrete particular objects as compounds of matter (hul¿) and form (morph¿).

Michael J. Raven is Professor of Philosophy at the University of Victoria and Affiliate Professor of Philosophy at the University of Washington. He is a co-founder and co-editor-in-chief of the journal Metaphysics, and also a co-founder and steering committee member of the Metaphysics Collaborative.