Campbell is a PhD student in the Philosophy of Biology under the supervision of Paul Griffiths and Dalia Nassar. His research explores the ontological foundations of the concept of 'organism' as it has developed over the last three centuries, and examines its role in contemporary biological attempts to interpret the living world. His work aims to blend analytic approaches to the ontology of the organism and biological individuality with perspectives from continental philosophy, including from German Idealism (Kant, Hegel and Schelling) through to twentieth century French ‘biophilosophy’, in particular Georges Canguilhem.