Roger Cardinal is the author of the book Outsider Art, published in 1972, and is Emeritus Professor at the University of Kent. Outsider Art was the first book in English to be published on the subject of Art Brut and also introduced the term 'outsider art.' In 1979 he and Victor Musgrave curated 'Outsiders' at the Hayward Gallery, London. Cardinal has published widely on individual outsider artists and written essays on outsider architecture, prison art, autistic art and memory painting. He is a contributing editor of Raw Vision and co-wrote Raw Erotica (2013) along with John Maizels and Colin Rhodes. Cardinal is also on the International Jury of Insita Triannual Exhibition, held in Slovakia.
- Raw Erotica: Sex, Lust and Desire in Outsider Art, ed. John Maizels, Raw Vision, 2013, p.208