Between January 2010 and December 2019, while working as a lecturer at Ulster University, Sneddon’s research has filled a major lacuna in early modern and modern academic witchcraft studies by unearthing the extent of belief in, and practice of, witchcraft and ‘beneficial’ magic in Ireland (c.1500-2000). Witchcraft studies has grown exponentially in the last half a century, but Ireland was overlooked primarily because the legal and Church records required to research the subject were destroyed in a fire in the Public Record Office in Dublin in 1922. Painstaking source reconstruction that involved tracking down surviving examples of these documents in archives and libraries in Britain, Ireland and America, along with source substitution using contemporary newspapers, printed books, visual imagery, and objects of material culture, allowed Sneddon to recover an important, ‘hidden’ part of Irish social and cultural history. The research has appeared in academic monographs and in leading international academic journals. The monograph Witchcraft and Magic was the first academic overview of Irish witchcraft and popular magic since 1913, while Possessed by the Devil was the first micro-study of an early modern, Irish mass trial, that of the ‘Islandmagee Witches’ in 1711.