He is now remembered best for words he supplied to traditional airs, such as My Lagan Love and Gartan Mother's Lullaby; his verse was also set to music by Arnold Bax and Ivor Gurney.
The Little Cowherd of Slainge was performed by the ULT at the Clarence Place Hall in Belfast on 4 May 1905, along with Lewis Purcell's The Enthusiast.
The following year he published a translation from Irish of the short stories of Patrick Pearse, one of the leaders of the Rising.
Business manager was George G. Lennon, former Officer Commanding of the County Waterford Flying Column during the Irish War of Independence.
Campbell returned to Ireland in 1939, settling at Glencree, County Wicklow, and dying at Lacken Daragh, Enniskerry on 6 June 1944.