Iona Margaret Balfour Opie, (13 October 1923 – 23 October 2017) and Peter Mason Opie (25 November 1918 – 5 February 1982) were an English married team of folklorists who applied modern techniques to understanding children's literature and play, in studies such as The Oxford Dictionary of Nursery Rhymes (1951) and The Lore and Language of Schoolchildren (1959). They were also noted anthologists, assembled large collections of children's literature, toys, and games and were regarded as world-famous authorities on children's lore and customs.Their research had a considerable impact on a number of research fields, including Folklore and Childhood Studies and altered perceptions of children's street culture and notions of play, by emphasising the agency of children.Working outside of academia, the couple worked together closely, from their home (firstly near Farnham, Surrey, later in Alton, Hampshire) conducting primary fieldwork, library research, and interviews with thousands of children. In pursuing the folklore of contemporary childhood they directly recorded rhymes and games in real time as they were being sung, chanted, or played. They collaborated on several celebrated books and produced over 30 works. Source: Wikipedia (en)