The son of an army major, Croker has little school education but does read widely while working in merchant trade. For some years Croker holds a position in the Admiralty, where his distant relative, John Wilson Croker, is his superior.
Croker devotes himself largely to the collection of ancient Irish poetry and Irish folklore. He assists in founding the Percy Society and the Camden Society. He and his wife’s testimonies about funereal customs, particularly the tradition of keening the deceased are among the earliest and most significant contributions to the understanding of the Irish languagelament and the accompanying traditions. The first part of his Fairy Legends and Traditions of the South of Ireland is published in 1825. It grows to six editions and is translated into German by the Brothers Grimm (Irische Elfenmärchen, 1826). Parts two and three follow in 1828, the latter including Croker’s translation of the long Grimm preface to part one.
Croker publishes Legends of the Lakes: Or, Sayings and Doings at Killarney in 1829, in which he features discussions of the music of his friend, the Irish piper James Gandsey.
From November 1930 to 1957, Hewitt holds positions in the Belfast Museum & Art Gallery. His radical socialist ideals prove unacceptable to the Belfast Unionist establishment and he is passed over for promotion in 1953. Instead in 1957 he moves to Coventry, a city still rebuilding following its devastation during World War II. He is appointed Director of the Herbert Art Gallery & Museum where he works until retirement in 1972.
Hewitt is appointed the first writer-in-residence at Queen’s University Belfast in 1976. His collections includes The Day of the Corncrake (1969) and Out of My Time: Poems 1969 to 1974 (1974). He is also made a Freeman of the City of Belfast in 1983, and is awarded honorary doctorates at the University of Ulster and Queen’s University Belfast.
Hewitt has an active political life, describing himself as “a man of the left,” and is involved in the British Labour Party, the Fabian Society and the Belfast Peace League. He is attracted to the Ulster dissenting tradition and is drawn to a concept of regional identity within the island of Ireland, describing his identity as Ulster, Irish, British and European. He officially opens the Belfast Unemployed Resource Centre (BURC) Offices on May Day 1985.
John Hewitt dies in Belfast on June 22, 1987. His life and work are celebrated in two prominent ways – the annual John Hewitt International Summer School and, less conventionally, the John Hewitt Bar and Restaurant, a Belfast pub is named after him. The bar is named after him as he officially opens the Belfast Unemployed Resource Centre, which owns the establishment. It is a popular meeting place for local writers, musicians, journalists, students and artists. Both the Belfast Festival at Queen’s and the Belfast Film Festival use the venue to stage events.