Douglas Campbell is Philosophy Lecturer at the University of Canterbury, New Zealand, and completed his PhD at the University of Arizona, USA. With a background in biology, he has worked as a wildlife warden and conservationist. His research interests include philosophy of mind, philosophical logic, epistemology and metaphysics. His work on de-extinction has included public lectures, conference presentations, and academic journal articles.Patrick Michael Whittle, who holds a PhD in Philosophy from the University of Canterbury, New Zealand, is a freelance writer and journalist based in Christchurch, New Zealand. As well as writing about science, politics and environmental issues (including de-extinction) at both a popular and academic level, he has worked in universities and educational establishments in New Zealand, Europe, the Middle East and Central Asia.