Christopher Sclater Millard (1872–1927) was the author of the first bibliography of the works of Oscar Wilde as well as several books on Wilde.
 Millard's bibliography was instrumental in enabling Wilde's literary executor, Robert Baldwin Ross to establish copyright on behalf of his estate.
Philip Ó Ceallaigh (born 23 March 1968) is an Irish short story writer living in Bucharest.
 The New Zealand writer Charlotte Grimshaw described him as a "clever Irish writer".
 Michel Faber, in "The Guardian", described his control of tone, dialogue and narrative contour as "masterful".
 Ó Ceallaigh won the 2006 Rooney Prize for Irish Literature and was the first Irish writer to be shortlisted for the Frank O'Connor International Short Story Award.
M. E. Francis was the pen name of Mary Elizabeth Blundell (née Sweetman 1859 – 9 March 1930) who was a prolific Irish novelist.
 She was described as the best known woman novelist of the day.
Thomas Joseph Gerard Victory (24 December 192114 March 1995) was a prolific Irish composer.
 He wrote over two hundred works across many genres and styles, including tonal, serial, aleatoric and electroacoustic music.
George Bernard O'Neill (17 July 1828 – 23 September 1917), was a prolific Irish genre painter, from 1859 a member of the Cranbrook Colony of artists.
Janet McNeill (14 September 1907 – October 1994) was a prolific Irish novelist and playwright.
 Author of more than 20 children's books, as well as adult novels, plays, and two opera libretti, she was best known for her children's comic fantasy series "My Friend Specs McCann".
Gerard J. Murphy (November 1948 – 12 October 2006) MRIA was a prolific Irish mathematician.
 His textbooks are internationally acclaimed, and translated into different languages.
 He died from cancer in October 2006, at the age of 57.
Oscar Fingal O'Flahertie Wills Wilde (16 October 185430 November 1900) was a prolific Irish writer who wrote plays, fiction, essays, and poetry.
 After writing in different forms throughout the 1880s, he became one of London's most popular playwrights in the early 1890s.
 He is best remembered for his epigrams and plays, the novel "The Picture of Dorian Gray", as well as the circumstances of his imprisonment and early death.
Cathal Ó Sándair (1922–1996), was one of the most prolific Irish language authors.
William Joseph Barre (1830, Newry - 1867) was a prolific Irish architect who built many well known buildings in Belfast in a Gothic Revival style, but was always overshadowed by his great rival, Charles Lanyon.

Question: Christopher Sclater Millard's work was helpful in the estate of which prolific Irish writer?
Answer: Oscar Wilde