R. D. Perry is associated with English, Medieval Studies, and Critical Theory.  He works primarily in the literature of late-medieval England, from Chaucer, Gower, and Langland, through to Hoccleve and Lydgate, up to the transitional figures of Dunbar and Skelton.  He also has interests in the influence of medieval philosophy on 20th-Century Critical Theory and philosophy and on the religious culture of medieval England after the Fourth Lateran Council.