M. J. S. Hodge is Honorary Research Fellow at the University of Leeds. He is the author of Origins and Species (1991), Before and After Darwin (2008) and Darwin Studies (2009), and co-editor with Gregory Radick of The Cambridge Companion to Darwin (Cambridge, 2009).

Gregory Radick is Professor of History and Philosophy of Science at the University of Leeds. His books include The Simian Tongue: The Long Debate about Animal Language (2007) and, as co-editor with Jonathan Hodge, The Cambridge Companion to Darwin (Cambridge, 2009).