Mark Williams was born in 1980 in London and is Fellow and Tutor in Medieval English Literature at Lincoln College, Oxford. He works on the medieval literatures and languages of Ireland and Wales, with a focus on the supernatural, the aesthetic and the imaginal. His first book, Fiery Shapes: Celestial Portents and Astrology in Ireland and Wales, 700–1700, came out from Oxford University Press in 2010. His current project is a cultural history of the gods of Irish myth, to be called Ireland’s Immortals.