Crofton is a writer and researcher specialising in technology and security topics. His areas of focus include surveillance, military contracting and secret detention. His book Negative Publicity: Artefacts of Extraordinary Rendition (with Edmund Clark, Aperture 2016) won the Rencontres d’Arles Photo-Text Book Award and the International Center of Photography Infinity Award for Documentary and Photojournalism, as well as forming the basis for several international exhibitions and installations. He has a PhD in the history of philosophy from the Warburg Institute, University of London.